Support sysstat! The sysstat package contains various utilities, common to many commercial Unixes, to monitor system performance and usage activity: iostat reports CPU statistics and input/output statistics for block devices and partitions. mpstat reports individual or combined processor related statistics.
What is pidstat command in Linux?
This is used for process monitoring and current threads, which are being managed by kernel. pidstat can also check the status about child processes and threads. 6. Using pidstat command without any argument, will display all active tasks. 7. To print all active and non-active tasks use the option ‘ -p ‘ (processes).
How to get I/O statistics using pidstat?
Using pidstat command with ‘ -d 2 ‘ option, we can get I/O statistics and 2 is interval in seconds to get refreshed statistics. This option can be handy in situation, where your system is undergoing heavy I/O and you want to get clues about the processes consuming high resources.
How to check statistics about the mounted file systems in Linux?
Check statistics about the mounted file systems using ‘ -F ‘. 17. View network statistics using ‘ -n DEV ‘. 18. View block device statistics like iostat using ‘ -d ‘. 19. To print memory statistics use ‘ -r ‘ option. 20. Using ‘ safd -d ‘, we can extract data in format which can be processed using databases.
How to display statistics about all the CPUs in a system?
Using mpstat with option ‘ -P ‘ (Indicate Processor Number) and ‘ALL’, will display statistics about all CPUs one by one starting from 0. 0 will the first one. 3. To display the statistics for N number of iterations after n seconds interval with average of each cpu use the following command.
Which command can be used to see what network services are running on your network?
netstat (network statistics) is a command-line tool for monitoring network connections both incoming and outgoing as well as viewing routing tables, interface statistics, etc. netstat is available on all Unix-like Operating Systems and also available on Windows OS as well.
What command can be used to view what shared libraries are required by a certain program?
3. Using the ldd Command. The ldd utility is a shell script. It outputs the shared libraries required by a program.
Which option to the IPTables command can be used to specify the default policy for a certain chain type?
iptables -P INPUT DROP The -P switch sets the default policy on the specified chain. So now we can set the default policy on the INPUT chain to DROP. This means that if an incoming packet does not match one of the following rules it will be dropped.
What command can be used to see what actual time servers are being used for synchronization?
The command ‘ntpq -pn’ is the main command used by this check to identify the NTP synchronization status of the CVM or the host. Where remote is the remote peer or server being synced to. “127.127. 1.0 LOCL” is this local host (included in case there are no remote peers or servers available).
What UNIX displays running processes?
Both Linux and UNIX support the ps command to display information about all running process. The ps command gives a snapshot of the current processes.
How do you see what network services are running in Linux?
Check running services on Linux
- Check the service status. A service can have any of the following statuses:
- Start the service. If a service isn’t running, you can use the service command to start it.
- Use netstat to find port conflicts.
- Check xinetd status.
- Check logs.
- Next steps.
Which utility is used to update shared library cache based on path given?
You need to use the ldconfig command to create, update, and remove the necessary links and cache (for use by the run-time linker, ld.so) to the most recent shared libraries found in the directories specified on the command line, in the file /etc/ld.
Which command shows all shared libraries required by a binary executable or another shared library?
Use the ‘otool’ command on OS X to show the libraries that are linked to an executable or another shared library: Be aware: The libraries are not sorted by name in the output!
How do I see shared libraries dependencies?
Steps to find shared library dependency in Linux:
- Launch your preferred terminal application.
- Get absolute path of the program you want to check.
- Print shared object dependencies using ldd.
- Find dynamic library required by program using readelf.
- Read library requirement of running processes from /proc/
What is the function of the iptables command?
iptables is a command line interface used to set up and maintain tables for the Netfilter firewall for IPv4, included in the Linux kernel. The firewall matches packets with rules defined in these tables and then takes the specified action on a possible match.
What does the option do in the command iptables?
Structure of iptables Options. The
What is iptables command in Linux?
The iptables command is a powerful interface for your local Linux firewall. It provides thousands of network traffic management options through a simple syntax.
What command can be used to view and modify the date and time within the BIOS?
Just type hwclock, which will display the date and time of your system’s hardware clock. This is the same date and time that you’ll see from the BIOS screen. You can also use option -r, or –show to display the date and time.
What option can be added to the netstat command in order to display network statistics?
Execute netstat with -r to show the IP routing table. This is the same as using the route command to execute route print. The -s option can be used with the netstat command to show detailed statistics by protocol.
How do you query a time server?
To verify the NTP server list:
- Hold the windows key and press X to bring up the Power User menu.
- Select Command Prompt.
- In the command prompt window, enter w32tm /query /peers.
- Check that an entry is shown for each of the servers listed above.
How long does sysstat take to collect data?
Default sysstat configuration collects data every 10 minutes. You can change it easily. If you got a fast system or you need more intensive monitoring of your system (i.e. a web server with enough RAM and Processor), then you might want to reduce the collection interval from 10 minutes to 2 minutes.
How to check CPU usage history with sysstat/SAR?
As a last minute check, let’s check some historical Sysstat files. In this way, you can go back since the date you’ve enabled sysstat / sar to check historical data. 1. CPU Usage of ALL CPUs (sar -u) This gives the cumulative real-time CPU usage of all CPUs. “1 3″ reports for every 1 seconds a total of 3 times.
Linux Final Exam – Subjecto.com
|SIGQUIT||Which kill signal terminates a process by takingthe process information in memory and saving it to a file called core on thehard disk in the current working directory?|
|127||What number indicates the lowest kernel priority(PRI) of a process possible?|
|pstree||What command below is used to display the lineageof a process by tracing its PPIDs until the init daemon?|
|The process is currently running on the processor.||In the process state column, what does an″R″ indicate?|
|-l||In order to display a list of at job IDs, whatoption can be specified to the at command?|
|-e||What option, when added to the crontab command,opens the vi editor with a user’s cron table?|
|+||When there are multiple background processesexecuting in the shell, the jobs command indicates the most recent one withwhich symbol?|
|-e||What option can be used with the ps command todisplay an entire list of processes across all terminals and includingdaemons?|
|64||How many different kill signals can be sent by thekill command to a given process?|
|process state||In the output of the ps -l command, what column isthe most valuable to systems administrators because it indicates what theprocess is currently doing?|
|device calls||Which of the following is not one of the three maintypes of Linux commands?|
|fg||After a background process has been started, whatcommand below can be used to move it to the foreground?|
|sixth||In a cron table entry, what field specifies theabsolute pathname to a command that is to be executed?|
|/var/spool/at||On a Fedora based system, where are the shellenvironment and scheduled commands for at stored?|
|The process is high priority.||When viewing the output of the ps ax command, whatdoes a < symbol in the STAT column indicate for a process?|
|parent process ID||What can be used on a Linux system to trace thelineage of each child process?|
|SIGHUP||What kill signal stops a process, then restarts itwith the same PID?|
|What character, when appended to a command, causesthe command to be run in the background?|
|0||Processes are started with what nice value bydefault?|
|%||When killing a background job with the killcommand, the background job ID must be prefixed by what character below?|
|newgrp||To change the primary group temporarily to anothergroup that is listed in the output of the groups and id commands, you can usewhich command below?|
|-L||A user account can be locked with the usermodcommand using what option?|
|-r||What option can be added to the userdel command toremove the home directory of the target user?|
|lp||In order to send a print job to a printer usingCUPS, what command must be used?|
|login.defs||What configuration file contains parameters thatset the default location for e-mail, password expiration information, minimumpassword length, and the range of UIDs and GIDs available for use?|
|lpadmin||Which command should be used to restrict access toprinters?|
|SystemMaxUse||What option can be used in the journaldconfiguration file to specify a file size limit to the event log?|
|-p||Select the option that can be used with the lpstatcommand to display a list of printers that are enabled:|
|0||On Linux, the root user always has a UID of whatnumber?|
|631||The CUPS Web administration tool can be accessedvia web browser by accessing what TCP port below?|
|lpstat||Adding the -t option to what command below willprovide a list of all printers on the system and their status?|
|useradd||In order to create user accounts on a Linux system,what command should be utilized?|
|alert||What System Log Daemon priority indicates an errorthat should be rectified immediately, such as a corrupt system database?|
|panic||What priority used by the System Log Daemonindicates a very serious system condition that would normally be broadcast toall users?|
|-d||What option should be used in conjunction with thelp command in order to specify the destination printer name?|
|secure||What log file contains information and errormessages regarding network access generated by daemons such as ssd andxinetd?|
|50||What is the default print job priority for allprint jobs created by the lp command?|
|514||The System Log Daemon uses what TCP and UDP port toaccept incoming requests from another System Log Daemon on a remote system?|
|pwconv||A system that uses an /etc/passwd file only can beconverted to use /etc/shadow for security by using what command?|
|/etc/skel||Where is the skeleton directory located on mostLinux systems?|
|-l||Select the option that, when used with the gzipcommand, causes the compression ratio for files that have been compressed tobe listed:|
|rpm2cpio||An RPM package can be converted to a cpio archiveusing what command?|
|-P||What option can be added to the dpkg command toremove a specified package from the system, including any configuration filesused by the package?|
|dpkg-query||What command can be used to search for DPM packageinformation?|
|60%-70%||What is the average compression ratio for the gziputility using the LZ77 compression algorithm?|
|RPM||Most Linux distributions make use of what packagemanager?|
|.Z||When using the compress utility, each filespecified for compression is renamed with what extension?|
|40-50||The Adaptive Lempel-Ziv compression algorithm usedby the compress utility is capable of an average compression ratio of whatpercent?|
|6||If no level of compression is specified, the gzipcommand assumes what compression level?|
|yum grouplist||What yum command below can display a list ofpackage group names?|
|zcat||What command can be used to display the contents ofa file that was compressed with the compress utility?|
|-c||When used with the uncompress command, what optiondisplays the contents of the compress file to Standard Output?|
|nine||The dump/restore utility is limited to a maximum ofhow many different incremental backups?|
|/dev/nht0||What device file below indicates the first ATAPIIDE tape device (nonrewinding)?|
|apt-get||In order to download DPM packages, what commandshould be used below?|
|make||What command looks for a Makefile and uses theinformation within to compile the source code into binary programs using theappropriate compiler program for the local hardware architecture?|
|package dependency||RPM packages that require other RPM packages to beinstalled on a system prior to being installed creates a relationship knownas?|
|-f||When used with the compress command, what optionbelow can be used to compress symbolic links?|
|-q||What option can be added to the rpm command inorder to query packages?|
|-F||What option can be added to the rpm command toupgrade a specified package only if an older version exists on the system?|
|traceroute||What command can be used to troubleshoot routing bydisplaying all routers between the current computer and a remote computer?|
|:||IPv6 IP addresses are delimited by what characterbelow?|
|/var/log/samba||Where are the log files for the Samba daemonlocated?|
|-X||What option can be used with ssh to enabletunneling of X Windows information?|
|ifconfig||What command can be used to assign a TCP/IPconfiguration to a NIC as well as view the current configuration of allnetwork interfaces?|
|net.ipv4.ip_forward||In order to enable IP routing on Linux at boot,what setting must be configured in /etc/sysctl.conf?|
|ping||Select the command that can be used to send a smallTCP/IP packet to another IP address and await a response:|
|Secure Shell (SSH)||What tool below was designed as a secure remoteaccess utility that encrypts information that passes across the network?|
|0-1023||What range of ports is considered to be″well-known″?|
|-i||What option can be added to the netstat command inorder to display network statistics?|
|hexadecimal||An IPv6 IP address consists of 16-bit numbers inwhat numbering scheme?|
|255.255.0.0||What is the subnet mask for a Class B IP address?|
|/etc/ssh/sshd_config||The sshd daemon is configured by editing whatconfiguration file?|
|256-bit||What is the Advanced Encryption Standard (AES)encryption algorithm’s largest key length size?|
|25||What well-known TCP port is utilized by the SMTPservice?|
|three||How many DNS servers can be configured in the/etc/resolv.conf file?|
|TCP/IP||What is the most commonly used LAN protocol?|
|255.255.255.0||What is the subnet mask for a Class C IP address?|
|/etc/named.conf||Select below the configuration file that is used toconfigure the BIND / DNS server:|
|8-bit||Each octet in an IP address represents a binarynumber consisting of how many bits / bytes?|
|hwclock||What command can be used to view and modify thedate and time within the BIOS?|
|@server||How can you specify the intended DNS server toquery with the dig command?|
|/var/named/named.local||What zone configuration file contains a PTR recordused to identify the loopback adapter?|
|0||In NTP, what stratum consists of atomic devices orGPS clocks?|
|!||What FTP command runs a shell on the localcomputer?|
|tzselect||In order to change the time zone of a system afterinstallation, what command must be used?|
|mput filename||What ftp command uploads the filename from thecurrent directory on the local computer to the current directory on theremote computer, and allows the use of wildcard metacharacters to specify thefilename.|
|TCP 80||The Apache daemon listens for HTTP requests on whatport by default?|
|DirectoryIndex index.html||What directive below in Apache’sfilespecifies that the index.html file in the document root directory will besent to clients who request an HTML document?|
|/var/www/html||Where is the default document root directory forthe Apache web server?|
|curl||Which command below can be used at a BASH commandprompt to obtain a web page?|
|pg_dump||What PostgreSQL command-line utility backs upPostgreSQL database settings?|
|15||What is the maximum number of characters that canbe used in a NetBIOS name?|
|DROP DATABASE||Select the SQL statement below that can be used todelete a database:|
|UDP 123||What port is used by the Network Time Protocol(NTP) for communication?|
|ntp_query||What command can be used to see what actual timeservers are being used for synchronization?|
|HELO||When working with Sendmail, what command can beused to test SMTP support?|
|DNS||What kind of servers resolve fully qualified domainnames to IP addresses for a certain namespace on the Internet?|
|MX||What DNS resource record type is used to providethe IP address for the e-mail server for a zone?|
|newaliases||After modifying the /etc/aliases file, what commandmust be run in order to rebuild the aliases database?|
|Universal Access||Assistive technologies are configured using whatutility on Fedora 20 in GNOME?|
|-P||What option for the iptables command can be used tospecify the default policy for a certain chain type?|
|-q||Which sar command option is used to displaystatistics for the processor queue?|
|jabbering||Older hardware that is malfunctioning may begin tosend large amounts of information to the CPU when not in use. What is thisprocess called?|
|nohup||Running background processes using what commandallows you to exit your command-line shell without ending any backgroundprocesses?|
|ssh_host_dsa_key. pub||What file contains the DSA public key in the/etc/ssh directory?|
|SIGHUP||If applications run into difficulties gainingresources during execution and stop functioning, restarting the process usinga specific kill signal may resolve the issue. Select the proper kill signalbelow:|
|ulimit||What command can be used to change the maximumnumber of file handles that can be used by a program?|
|TCP wrapper||If network services that are started by inetd orxinetd are in use, what can be used to provide extra security?|
|1024||By default, the shell on a Linux system limits thenumber of filehandles a program can have open to what value?|
|Run the ldconfig command.||After downloading an installing any sharedlibraries, what should be done to ensure the list of shared librarydirectories and the list of shared libraries are updated?|
|iostat||What utility in the sysstat package measures theflow of information to and from disk devices?|
|every ten minutes||How often are sar commands scheduled to run on bothFedora 20 and Ubuntu Server 14.04?|
|-B||Select the option that, when used with the sarcommand, displays swap statistics:|
|nmap||Which command can be used to see what networkservices are running on your network?|
|Hard DIsk||What is the most common hardware component to failon a Linux system?|
|-V||What option can be specified with the rpm commandto identify any missing files in a package or package dependency?|
|ldd||What command can be used to view what sharedlibraries are required by a certain program?|
|-d||Select the iptables option that specifies thedestination address of packets for a rule:|
|xwininfo||If X Windows fails to start, what command can beused to troubleshoot the issue?|
20 Netstat Commands for Linux Network Management
It is possible to monitor network connections, both incoming and outgoing, using the Netstat command-line utility.It also allows you to see information about routing tables, interface statistics, and other network data.All Unix-like operating systems, as well as the Windows operating system, provide netstat as a standard feature.It is quite handy when it comes to network troubleshooting and network performance monitoring.
- When it comes to network service debugging tools, netstat is one of the most basic.
- It tells you what ports are open and if any applications are listening on those ports.
- This program has been superseded by the new ss command in Linux, which is capable of presenting more information about network connections and is far quicker than the previous netstat command, which has been deprecated.
- The netstat utility is extremely significant and quite valuable for Linux network administrators as well as system administrators since it allows them to monitor and fix their network-related problems as well as assess the performance of network traffic.
- It is shown in this article how to use the netstat command, along with several examples that may be beneficial in daily operations.
1. Listing all the LISTENING Ports of TCP and UDP Connections
Using the netstat -a option, you may get a list of all open ports (including TCP and UDP).netstat -a |more Internet connections that are active (servers and established) Proto Recv-Q Send-Q Local AddressForeign AddressState tcp00 *:sunrpc*:*LISTEN tcp052 192.168.0.2:ssh192.168.0.1:egsESTABLISHED tcp052 192.168.0.2:ssh192.168.0.1:egsESTABLISHED TCP port 10 (192.168.0.2): *LISTEN tcp00 localhost:smtp* 59292CLOSE WAIT tcp00 *:59482* *LISTEN udp00 *:35036* udp00 *:npmp-local* udp00 *:npmp-local* udp00 *:npmp-local* Active UNIX domain sockets 59292CLOSE WAIT (servers and established) Proto RefCnt FlagsTypeStateI-Node Path RefCnt FlagsTypeStateI-Node Path unix2STREAMLISTENING16972/tmp/orbit-root/linc-76b-0-6fa08790553d6 unix2STREAMLISTENING17149/tmp/orbit-root/linc-794-0-7058d584166d2 unix2STREAMLISTENING17161/tmp/orbit-root/linc-792-0-546fe905321cc unix2STREAMLISTENING17149/tmp/orbit-root/linc-794-0-7058d584166d2 unix2STREAMLISTENING15938/tmp/orbit-root/linc-74b-0-415135cb6aeab
2. Listing TCP Ports connections
Using the netstat -at command, only TCP (Transmission Control Protocol) port connections are listed.netstat -at is a command that displays the status of the network.Internet connections that are active (servers and established) Proto Recv-Q Send-Q is an abbreviation.Local Postal Code Foreign AddressState tcp00 *:ssh*:*LISTEN tcp00 localhost:ipp*:*LISTEN tcp00 localhost:smtp*:*LISTEN tcp00 localhost:ipp*:*LISTEN tcp00 localhost:smtp*:*LISTEN tcp00 localhost:smtp*:*LISTEN STOP LISTENING TO tcp052 192.168.0.2:ssh192.168.0.1:egsESTABLISHED TCP/IP CONNECTION The tcp10 address is 192.168.0.2:59292CLOSE WAIT.
3. Listing UDP Ports connections
In the following example, netstat -au is used to list only UDP (User Datagram Protocol) port connections.Internet connections that are active (servers and established) Proto Recv-Q Send-Q is an abbreviation.Local Postal Code Address in a foreign country State udp00 *:35036*:* udp00 *:npmp-local*:* udp00 *:mdns*:* udp00 *:npmp-local*:* udp00 *:npmp-local*:* udp00 *:npmp-local*:* udp00 *:npmp-local*:*
4. Listing all LISTENING Connections
Netstat -l displays a list of all active listening port connections.netstat -l Active Internet connections are listed (only servers) Proto Recv-Q Send-Q Local AddressForeign AddressState AddressProto Recv-Q Send-Q tcp00 *:sunrpc*:*LISTEN tcp00 *:58642*:*LISTEN tcp00 *:ssh*:*LISTEN udp00 *:35036*:* udp00 *:npmp-local*:* udp00 *:35036*:* udp00 *:npmp-local*:* udp00 *:npmp-local Sockets in the UNIX domain that are currently active (only servers) Proto RefCnt FlagsTypeStateI-Node Path RefCnt FlagsTypeStateI-Node Path unix2STREAMLISTENING16972/tmp/orbit-root/linc-76b-0-6fa08790553d6 unix2STREAMLISTENING17149/tmp/orbit-root/linc-794-0-7058d584166d2 unix2STREAMLISTENING17161/tmp/orbit-root/linc-792-0-546fe905321cc unix2STREAMLISTENING17149/tmp/orbit-root/linc-794-0-7058d584166d2 unix2STREAMLISTENING15938/tmp/orbit-root/linc-74b-0-415135cb6aeab
5. Listing all TCP Listening Ports
Using the option, you may get a list of all the active TCP ports that are listening. the command netstat -lt. netstat -lt Internet connections that are active (only servers) Proto Recv-Q Send-Q is an abbreviation. Tcp00 *:dctp*:*LISTEN tcp00 *:mysql*:*LISTEN tcp00 *:munin*:*LISTEN tcp00 *:ftp*:*LISTEN tcp00 localhost.localdomain:ipp*:*LISTEN tcp00 *:ssh*:*LISTEN tcp00 *:*:*LISTEN
6. Listing all UDP Listening Ports
Using the option, you may get a list of all the UDP ports that are actively listening.the command netstat -lu.the command netstat -lu Internet connections that are active (only servers) Proto Recv-Q Send-Q Local AddressForeign AddressState AddressProto Recv-Q Send-Q *:39578:* udp00 *:meregister*:* udp00 *:vpps-qua*:* udp00 *:sunrpc*:* udp00 *:ipp*:* udp00 *:60222:* udp00 *:mdns*:* udp00 *:sunrpc*:*
7. Listing all UNIX Listening Ports
Using the netstat -lx command, you may get a list of all active UNIX listening ports.netstat -lx Active UNIX domain sockets (only servers) Proto RefCnt FlagsTypeStateI-Node Path unix Proto RefCnt FlagsTypeStateI-Node Path unix The address is [email protected] ABSTRACT NAMESPACE on the unix system.2STREAMLISTENING5767/var/run/cups/cups.sock unix /var/run/cups/cups.sock [email protected]/tmp/fam-root-unix [email protected]/tmp/fam-root-unix 2STREAMLISTENING6157/dev/gpmctl unix 2STREAMLISTENING6157/dev/gpmctl unix [email protected]/var/run/hald/dbus-IcefTIUkHm unix Unix font fs7100 2STREAMLISTENING6038/tmp/.font-unix/fs7100 2STREAMLISTENING6175/var/run/avahi-daemon/socket unix 2STREAMLISTENING6175/var/run/avahi-daemon/socket unix [email protected] UIP ABSTRACT NAMESPACE unix [email protected] UIP ABSTRACT NAMESPACE unix 2STREAMLISTENING60835836 /var/lib/mysql/mysql.sock unix /var/lib/mysql/mysql.sock the UNIX command 2STREAMLISTENING4645/var/run/audispd events 2STREAMLISTENING5136/var/run/dbus/system bus socket unix /var/run/dbus/system bus socket [email protected]/var/run/hald/dbus-wsUBI30V2I unix [email protected]/var/run/hald/dbus-wsUBI30V2I unix socket /var/run/acpid.socket 2STREAMLISTENING5517/var/run/acpid.socket unix 2STREAMLISTENING5531/var/run/pcscd.comm
8. Showing Statistics by Protocol
Statistics are shown according to the protocol.By default, statistics for the TCP, UDP, ICMP, and IP protocols are shown alongside each other.It is possible to define a set of protocols using the -s argument.netstat -s (network statistics) Ip: A total of 2461 packets were received by this IP.
- 0 messages have been forwarded 0 inbound packets were rejected.
- 2431 inbound packets were successfully delivered A total of 2049 requests were sent out.
- Icmp: 0 ICMP messages were received; 0 ICMP messages were attempted; 0 ICMP messages were unsuccessful.
- The ICMP input histogram shows that one ICMP message was sent.
- 0 ICMP messages were unsuccessful.
- The ICMP output histogram is as follows: 1 Tcp: 159 active connections openings, 1 passive connection openings, 1 destination unreachable 4 unsuccessful attempts to establish a connection Connection resets were received but only one connection was formed.
24 segments were retransmitted after being received 2191 segments were received 1745 segments were sent out There were no poor portions received.4 resets have been delivered.Udp: A total of 243 packets were received.
1 packets to an unknown port were successfully received.0 packets were received with errors.281 packets were despatched in total.
9. Showing Statistics by TCP Protocol
Netstat -st is used to provide statistics for only the TCP protocol when the option is used.Tcp: 2805201 active connections were established.There are 1597466 passive connection opportunities in total.37806 connection resets were obtained for a total of 1522484 unsuccessful connection attempts.
- There have been 1 connections formed.
- 57718706 segments were received, 64280042 segments were sent out, 3135688 segments were retransmitted, and 74 segments were received that were defective.
- 17580 resets have been sent.
10. Showing Statistics by UDP Protocol
Netstat -su is a command that displays the status of the network. Udp: A total of 1774823 packets have been received. 901848 packets to an unknown port were successfully received. 0 packets were received with errors. 2968722 packets have been sent.
11. Displaying Service name with PID
Using the netstat -tp option, you may display the service name together with their PID number, which will be displayed as ″PID/Program Name.″ netstat -tp Active Internet connections (without the need for a server).Proto Recv-Q Send-Q is an abbreviation.Geographical locationForeign geographic locationStatePID/Program name tcp00 192.168.0.2:ssh192.168.0.1:egsESTABLISHED 2179/sshd tcp10 192.168.0.2:59292CLOSE WAIT1939/clock-applet tcp11 192.168.0.2:59292CLOSE WAIT1939/clock-applet
12. Displaying Promiscuous Mode
When the -ac option is used to display Promiscuous mode, netstat will either publish the specified information or refresh the screen every five seconds.The default screen refreshes once per second, according to the user.grep netstat -ac 5 |grep netstat The tcp tcp00 *:sunrpc*:*LISTEN tcp00 *:58642*:*LISTEN tcp00 localhost:ipp*:*LISTEN tcp00 localhost:smtp*:*LISTEN tcp10 192.168.0.2:59447CLOSE WAIT tcp00 *:sunrpc:*LISTEN tcp00 *:ssh:*LISTEN tcp00 localhost:ipp:*LISTEN tcp00 localhost:smtp:*LISTEN tcp00 *:59482:*LISTEN tcp00 *:59482:*LISTEN tcp00 *:59482:*LISTEN tcp00 *:59482:
13. Displaying Kernel IP routing
With the netstat and route commands, you can see the IP routing table in the kernel. netstat -r displays the IP routing table in the kernel. DestinationGatewayGenmaskFlagsMSS Windowirtt Iface 192.168.0.0*255.255.255.0U0 00 eth0 link-local*255.255.0.0U0 00 eth0 default192.168.0.10.0.0.0UG0 00 eth0 default192.168.0.10.0.0.0UG0 00 eth0 default192.168.0.10.0.0.0UG0 00 eth0 default192.168
14. Showing Network Interface Transactions
Network interface packet operations, comprising both transmitting and receiving packets with MTU size, are displayed on the screen. netstat -i The Kernel Interface Table is displayed. IfaceMTU MetRX-OK RX-ERR RX-DRP RX-OVRTX-OK TX-ERR TX-DRP TX-OVR Flg eth01500044590004057000 BMRU lo16436080008000 LRU MetRX-OK RX-ERR RX-DRP RX-OVRTX-OK TX-ERR TX-DRP TX-OVR Flg eth01500044590004057000
15. Showing Kernel Interface Table
Similar to the ifconfig command, this displays the kernel interface table.Eth0’s kernel interface table is seen via netstat -ie.00:0C:29:B4:DA:21 is the EthernetHWaddr for this link.192.168.0.2 is the Internet address.
- Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80:20c:29ff: fe80:20c:29ff: feb4:da21/64 The purpose of this project is to link together BROADCAST RUNNING MULTICASTM.
- TU:1500 Amount of data: 1 RX packets, 4486 errors, zero lost packets, zero overrun packets, zero frame, and zero overrun packets.
- TX packets:4077 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2720253 TX packets:4077 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 (2.5 MiB) The number of bytes in TX is:1161745 (1.1 MiB) Interrupt:18 0x2000 is the address of the starting point.
- lo Local Loopback encap: Link encap:Local Loopback 127.0.0.1 is the Internet address.
- mask:255.0.0.0 inet6 addr::1/128 inet6 mask:255.0.0.0 The purpose of this project is to set up a loopback running system.
- M TU:16436 1 RX packets: 8 errors: 0 dropped: 0 overruns: 0 frame: 0 Metric: 1 RX packets: 8 errors: 0 dropped: 0 overruns: 0 frame: 0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:480 TX packets:8 errors:0 dropped:0 overruns:0 (480.0 b) TX bytes are 480.
16. Displaying IPv4 and IPv6 Information
Displays information about multicast group membership for both IPv4 and IPv6 networks.netstat -g is an abbreviation for network statistics.Membership in IPv6 and IPv4 Groups The InterfaceRefCnt Group consists of the following addresses: lo1all-systems.mcast.net eth0118.104.22.168 eth01all-systems.mcast.net lo1ff02:1 eth01ff02:202 eth01ff02:202 A unique identifier for the device eth01ff02:1:ffb4:da21 eth01ff02:1:ffb4:da21
17. Print Netstat Information Continuously
You may use the following command to receive netstat information every few seconds, which would output netstat information continually, say every few seconds.netstat -c Active Internet connections (without the need for a server).Proto Recv-Q Send-Q is an abbreviation.Local AddressForeign AddressStateState of Residence Time WAIT tcp00 tecmint.com:sg2nlhg007.shr.prod.s:36944 TIME WAIT tcp00 tecmint.com:sg2nlhg010.shr.prod.s:42110 TIME WAIT tcp0132 tecmint.com:ssh22.214.171.124.static-:64662 TIME WAIT ESTABLISHED tcp00 tecmint.com:crawl-66-249-71-240.g:41166 TIME WAIT tcp00 localhost.localdomain:54823 localhost.localdomain:smtpTIME WAIT tcp00 localhost.localdomain:54822 localhost.localdomain:smtpTIME WAIT tcp00 tecmint.com:sg2nlhg007.sh
18. Finding non-supportive Address
Identifying and obtaining some important information from unconfigured address families.netstat -verbose displays a lot of information.netstat: There is no support for the ‘AF IPX’ protocol on this system.netstat: There is no support for the ‘AF AX25’ protocol on this system.
- netstat: There is no support for the ‘AF X25’ protocol on this system.
- netstat: This system does not support the ‘AF NETROM’ command.
19. Finding Listening Programs
Determine the number of listening applications that are currently operating on a port. the command netstat -ap | the command grep tcp00 *:*:*LISTEN9056/ tcp00 tecmint.com:sg2nlhg007.shr.prod.s:57783 TIME WAIT- tcp00 tecmint.com:sg2nlhg008.shr.prod.s:57769 TIME WAIT- tcp00 tecmint.com:sg2nlhg0
20. Displaying RAW Network Statistics
Raw statistics are returned by the command netstat -statistics.IP address: 62175683 There were a total of 52970 packets received with incorrect addresses.0 ICMP messages forwarded: 875519 ICMP messages received: 901671 ICMP messages received with destination unreachable: 901671 16253 responses to echo request: 8 responses to echo request Icmp The following message was received: InType0: 83 IpExt: InMcastPkts: 117 That’s all there is to it.To learn more about the netstat command and its options, consult the netstat manual documentation or use the man netstat command to get all of the information you need.Please let us know if there is anything we have forgotten to include in the list by utilizing the comment box below.As a result, we might continuously updating this list in response to your feedback.
Check running services on Linux –
The most recent update was made on 2019-12-20.Rackspace is the author of this document.Support When it comes to troubleshooting a network service, the first step is to make sure that the service is up and working properly.If the service has an initialization (init) script installed, you can use the service command to start, stop, and check the status of the service.If the service does not have an initialization (init) script installed, you must use the service command.In Debian®-based distributions, this command refers to a service by referencing its init script, which is kept in the /etc/init.d directory, but in Red Hat®-based distributions, this script is located in the etc/rc.d/init.d directory.
If you are unsure of the name that the system uses for a service, you may look it up in any of the preceding directories by using the ls command followed by the name of the directory.Some names are different depending on where you get them.For example, Apache® is installed on the CentOS® operating system, whereas apache2 is installed on the Ubuntu® operating system.Please keep in mind that many recent Linux® versions utilize systemd instead of netstat to check for service availability.Alternatively, if you’re using systemd, you should replace all servicecommands with systemct1.
Check out the FedoraTM SysVinit to Systemd Cheatsheet for additional details on the systemct1 command and its options.
Check the service status
- There are several different service statuses that can be assigned to a service: start: The service has begun to operate
- Stop: The service has come to a complete halt.
- Restart: The service is restarting and will begin operating again once the procedure is completed
The following example demonstrates how to verify the status of a service on CentOS by using the following command: service status $ sudo servicestatus has been terminated.
Start the service
Service commands can be used to start or stop any services that are not already functioning.The service is started with the following example: Starting the service with sudo servicestart Whenever an application cannot be started, the system notifies the user of the failure and typically shows a message that explains the source of the failure.sudo servicestart is a command that starts a service.Starting(98) make sock: could not bind to address:80 since it was already in use: 80 (98) address 0.0.0.0:80 is already in use: make sock: could not bind to address 0.0.0.0:80 since it was already in use There are no listening sockets available, hence the system is shutting down.It was not possible to open logs.
Use netstat to find port conflicts
In the preceding example, the process cannot be launched since something else is currently listening on the port in question.The netstat command may be used to find out who is listening in on your network.For a list of listening applications and the ports that they are utilizing, type the following command into your terminal window: netstat -plnt is a command that displays the status of the network.Internet connections that are active (only servers) tcp00 10.176.77.113:33060.0.0.0:*LISTEN28509/mysqld tcp00 0.0.0.0:800.0.0.0:*LISTEN2113/nc tcp00 127.0.0.1:250.0.0.0:*LISTEN1115/master tcp00:22:*LISTEN1051/sshd tcp00:22:*LISTEN1051/sshd tcp00 The result demonstrates that the nc program (whose name appears in the Program name column) is listening on port 80, as shown by the output (which appears in the Local Address column).This software should be able to be launched again once it has been stopped.Observe: For further information on the netstat command, please visit Checking listening ports with the netstat command.
Check xinetd status
This might be because a super-server such as an Extended Internet Service Daemon (xinetd) is being used to begin the application when a connection is obtained, which is why it isn’t executing.If this is the case, it is possible that launching the service has remedied the problem.Verify that the problem has been fixed by running the following command: xinetd (pid8795) is now executing with the command sudo service xinetd status.
If you are unable to launch your service, check your logs to see if any information about the problem can be gleaned from them.
Examine the server resources to determine how much space your application is using up on the server once you’ve confirmed that the program is up and running.
Show library dependencies – Qt Wiki
De El Es Fa Fi Fr en Ar Bg De El Es Fa Fi Hi Hu It Ja Kn Ko Ms Nl Pl Pt Ru Sq Th Tr Uk Zh Hi Hu It Ja Kn Ko Ms Nl Pl Pt Ru Sq Th Tr Uk Zh The tools that are used to determine which libraries are required by an executable or another shared library are very platform-dependent.Listed below are the tools for various platforms (as well as basic usage instructions for some of them).Be warned that the tools may not always display all of the libraries that you require!It’s advisable to do a separate check on the libraries that are used by the application.Keep an eye out for plugins that may add additional requirements to your system!The wiki page Qt Library Cross Dependencies provides a list of some of the Qt libraries’ cross dependencies on each other.
In order to display libraries that are linked to an executable or another shared library, the ″ldd″ command is used in Linux.The ″ldd″ program outputs the path to the library as well as some address after the =>.In the event that the library is not there, the message ″not found″ is displayed.Take note that the libraries are not arranged alphabetically in the output!ldd myFancyProgram linux-vdso.so linux-vdso.so 1 => (0x00007ffd6d17000) libcurl-gnutls.so (0x00007ffd6d17000) libcurl-gnutls.so 4 => /usr/lib/libcurl-gnutls.so.4 (0x00007feb7c45a000) libMagick+ (0x00007feb7c45a000) libMagick+.so.
10 => /usr/lib/libMagick.so is the location of the library.libWand.so.10 (0x00007feb7c1e3000) is a shared library./usr/lib/libWand.so.10 (0x00007feb7bf1c000) libMagick.so.10 => /usr/lib/libWand.so.10 (0x00007feb7bf1c000) libMagick.so.10 => /usr/lib/libWand.so.10 (0x00007feb7bf1c000) libMagick 10 => /usr/lib/libMagick.so is the location of the library.10 (0x00007feb7bb25000) libQtAssistantClient.so (libQt Assistant Client).4 => /usr/lib/libQtAssistantClient.so is the location of the library.
4 libpthread.so.4 (0x00007feb7b91f000) is loaded.0 => /lib/libpthread.so.0 (0x00007feb7b703000) libQtWebKit.so (0x00007feb7b703000) libQtWebKit.so.4 => /usr/lib/libQtWebKit.so is the location of the library.4 (0x00007feb7aa8a000) libQtSvg.so.4 (0x00007feb7aa8a000) 4 => /usr/lib/libQtSvg.so is located in /usr/lib/libQtSvg.so.4 (0x00007feb7a836000) libQt3Support.so (libQt3Support.so).4 => /usr/lib/libQt3Support.so is located in the /usr/lib directory.
Fourteen (0x00007feb7a30b000) bytes of libQtXml.so.4 => /usr/lib/libQtXml.so is the location of the library.4 (0x00007feb7a0c2000) libQtGui.so.4 (0x00007feb7a0c2000) 4 => /usr/lib/libQtGui.so is the location of the library.
- 4 (0x00007feb7955c000) libQtNetwork.so (libQtNetwork.so).
- 4 => /usr/lib/libQtNetwork.so is the location of the library.
- 4 (0x00007feb79253000) libQtCore.so.4 (0x00007feb79253000) 4 => /usr/lib/libQtCore.so is the location of the library.
- 4 (0x00007feb78e11000) libstdc.so.4 (0x00007feb78e11000) 6 => /usr/lib/libstdc.so is the location of the library.
6 (0x00007feb78b06000) libm.so.6 (0x00007feb78b06000) 6 => /lib/libm.so is the path to the library.6 (0x00007feb78875000) libgcc s.so.6 (0x00007feb78875000) One of these is a library called /lib/libgcc s.so.1 (0x00007feb78677000) libc.so.1 (0x00007feb78677000) 6 => /lib/libc.so is the path to the library.libidn.so.6 (0x00007feb78315000) is a shared object.11 => /usr/lib/libidn.so is the location of the library.
- 11 (0x00007feb780e3000) libldap r-2.4.so is loaded into memory.
- 2 => /usr/lib/libldap r-2 is the location of the library.
- 4.so.2 (0x00007feb77e000) libgssapi krb5.so.4 (0x00007feb77e000) 2 => /usr/lib/libgssapi krb5.so.2 (0x00007feb77c73000) libkrb5.so.2 (0x00007feb77c73000) libkrb5.so.
- 3 => /usr/lib/libkrb5.so is the location of the library.
- There are three (0x00007feb779d000) libk5crypto.so files in total.
3 => /usr/lib/libk5crypto.so is the location of the library.3 (0x00007feb777b8000) libcom err.so (libcom error handling).2 => /lib/libcom err.so is the file to use.2 (0x00007feb7756000) libz.so.2 (0x00007feb7756000) 1 => /usr/lib/libz.so.1 (0x00007feb7739f000) libgnutls.so.1 (0x00007feb7739f000) libgnutls.so.13 => /usr/lib/libgnutls.so is located in the /usr/lib directory.
liblcms.so.13 (0x00007feb7711a000) is loaded.1 => /usr/lib/liblcms.so is the location of the library.1 (0x00007feb76e6000) libtiff.so (libtiff.so.1) 4 => /usr/lib/libtiff.so is the location of the library.libjpeg.so.4 (0x00007feb76c8d000) is a shared object.
52 ===================== libfontconfig.so is at address 62 (0x00007feb76a6a000).1 => /usr/lib/libfontconfig.so is the location of the font configuration file.libXext.so.1 (0x00007feb76839000) is a shared object.6 => /usr/lib/libXext.so is the location of the library.
libXt.so.6 (0x00007feb76628000) is a shared object.6, which is equivalent to libXt.so.6 (0x00007feb763c4000) libbz2.so.1.0 corresponds to the file /lib/libbz2.so.libfreetype.so is version 1.0 (0x00007feb761b4000).
6 => /usr/lib/libfreetype.so is the location of the library.libdl.so.6 (0x00007feb75f36000) is a shared library.2 => /lib/libdl.so.2 (0x00007feb75d32000) libSM.so.2 (0x00007feb75d32000) /usr/lib/libSM.so.6 (0x00007feb75b2a000) libICE.so.6 => /usr/lib/libICE.so.6 (0x00007feb75b2a000) libICE.so.6 6 => /usr/lib/libICE.so is the location of the library.6 (0x00007feb7590f000) libX11.so.2 (libX11.so.2) 6 => /usr/lib/libX11.so is the location of the library.
- 6 (0x00007feb7560c000) /lib64/ld-linux-x86-64.so.2 (0x00007feb7c696000) libsqlite3.so.2 (0x00007feb7c696000) libsqlite3.so.2 (0x00007feb7c696000) libsqlite3.so.2 (0x00007feb7c696000) libs 0 => /usr/lib/libsqlite3.so is the location of the SQLite3 library.
- libQtSql.so.0 (0x00007feb753a0000) libQtSql.so.0 (0x00007feb753a0000) libQtSql.so.0 (0x00007feb753a0000) libQtSql.so.0 (0x00007feb753a0000) libQtSql.so.0 (0x00007f 4 => /usr/lib/libQtSql.so is the location of the library.
- 4 (0x00007feb75160000) libaudio.so (libaudio.so is a shared library).
- 2 => /usr/lib/libaudio.so is the location of the library.
- 2 (0x00007feb74f47000) libpng12.so.2 (libpng12.so.2) 0 => /usr/lib/libpng12.so is the location of the library.
- libglib-2.0.so has a version of 0 (0x00007feb74d22000).
0 => /usr/lib/libglib-2.0.so is the location of the library.libXi.so.0 (0x00007feb74a62000) was found.6 => /usr/lib/libXi.so is the location of the library.6 (0x00007feb74859000) libXrender.so.2 (libXrender.so.2) 1 => /usr/lib/libXrender.so is the location of the library.libXrandr.so.1 (0x00007feb74650000) is loaded.
2 => /usr/lib/libXrandr.so is the location of the library.2 (0x00007feb74449000) libgthread-2.0.so (libgthread-2.0.so).0 => /usr/lib/libgthread-2.0.so is the location of the library.
librt.so.0 (0x00007feb74245000) was found.One is equal to /lib/librt.so.1 and so on.1 (0x00007feb7403c000) liblber-2.4.so.1 (0x00007feb7403c000) 2 => /usr/lib/liblber-2.4.so is the location of the library.2 (0x00007feb73e2e000) libresolv.so.2 (0x00007feb73e2e000) 2 => /lib/libresolv.so is the path to the library.libsasl2.so (0x00007feb73c18000) is loaded.
2 => /usr/lib/libsasl2.so is the location of the library.2 (0x00007feb739ff000) libkrb5support.so (libkrb5support.so).0 => /usr/lib/libkrb5support.so.0 (0x00007feb737f8000) libkeyutils.so.0 => /usr/lib/libkrb5support.so.0 (0x00007feb737f8000) libkeyutils.so.0 => /usr/lib/libkrb5support.so.0 (0x00007feb737f 1 => /lib/libkeyutils.so.1 => /lib/libkeyutils.so.1 => libtasn1.so (0x00007feb735f6000) is a shared object.3 => /usr/lib/libtasn1.so.3 (0x00007feb733e6000) libgcrypt.so.3 (0x00007feb733e6000) libgcrypt.so.3 (0x00007feb733e6000) libgcrypt.so.3 (0x00007feb733e6000) libgcrypt.so.3 (0x00007feb733 /lib/libgcrypt.so is the path to the library.libexpat.so (0x00007feb73198000) is the 11th file in the list.1 => /usr/lib/libexpat.so.1 (0x00007feb72f74000) libXau.so.1 (0x00007feb72f74000) libXau.so.1 6 => /usr/lib/libXau.so is the location of the library.
6 (0x00007feb72d72000) libxcb-xlib.so (libxcb-xlib.so).0 => /usr/lib/libxcb-xlib.so (/usr/lib/libxcb-xlib.so).libxcb.so has a version of 0 (0x00007feb72b71000).1 => /usr/lib/libxcb.so is the location of the library.libpcre.so (0x00007feb72956000) is a shared object.
- 3 => /usr/lib/libpcre.so is the location of the library.
- 3 (0x00007feb72730000) libgpg-error.so is a binary file.
- 0 => /lib/libgpg-error.so is the error code.
- libXdmcp.so has a version of 0 (0x00007feb7252d000).
- 6 => /usr/lib/libXdmcp.so is the location of the library.
- 6 a b c d e (0x00007feb72328000)
On OS X, the ″otool″ command can be used to display the libraries that are linked to an executable or another shared library, such as: Take note that the libraries are not arranged alphabetically in the output!$ otool -L menubar.app/Contents/MacOS/menubar menubar.app/Contents/MacOS/menubar: /usr/local/Trolltech/Qt-4.7.0-cocoa/lib/QtSql.framework/Versions/4/QtSql.framework menubar.app/Contents/MacOS/menubar: /usr/local/Trolltech/Qt-4 (compatibility version 4.7.0, current version 4.7.0) Versions/4 of the QtGui.framework are located at /usr/local/Trolltech/Qt-4.7.0-cocoa/lib/QtGui.framework/Versions/4 (compatibility version 4.7.0, current version 4.7.0) Versions/4 of the QtNetwork.framework are located at /usr/local/Trolltech/Qt-4.7.0-cocoa/lib/QtNetwork.framework (compatibility version 4.7.0, current version 4.7.0) QuarkXPress 4.7.0-cocoa lib QtCore.framework Versions 4 QuarkXPress 4.7.0-cocoa lib QtCore.framework Versions 4 (compatibility version 4.7.0, current version 4.7.0) /usr/lib/libstdc.6.dylib is a dynamic link library (compatibility version 7.0.0, current version 7.9.0) /usr/lib/libgcc s.1.dylib is a dynamic link library (compatibility version 1.0.0, current version 625.0.0) /usr/lib/libSystem.B.dylib is a dynamic link library (compatibility version 1.0.0, current version 125.2.1) If you are creating universal binaries (a single large executable that contains object code for several architectures such as x86, x86 64, and ppc), your output may look something like this: the command otool -L menubar.app/Contents/Macromedia/Menubar menubar.app/Contents/Macromedia/Menubar (architecture i386): $ otool -L menubar.app/Contents/Macromedia/Menubar (architecture i386): $ otool -L menubar.app/Contents/Macromedia/Menubar menubar.app/ (compatibility version 4.7.0, current version 4.7.0) Version 4 of the QtGui.framework is located in /var/lib/QtGui.framework and is named QtGui.framework/Versions/4 (compatibility version 4.7.0, current version 4.7.0) Version 4 of the QtNetwork.framework is located at /opt/Trolltech/Qt-4.7.0/lib/QtNetwork.framework/versions/4/QtNetwork (compatibility version 4.7.0, current version 4.7.0) The QtCore.framework version number is 4 in /usr/local/Trolltech/QuickTime-4.7.0.lib/QtCore.framework/Versions/4 (compatibility version 4.7.0, current version 4.7.0) /usr/lib/libstdc.6.dylib is a dynamic link library (compatibility version 7.0.0, current version 7.9.0) /usr/lib/libgcc s.1.dylib (compatibility version 1.0.0, current version 625.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 625.0.0) (compatibility version 1.0.0, current version 125.2.1) menubar.app/Contents/MacOS/menubar (architecture ppc): /usr/local/Trolltech/Qt-4.7.0/lib/QtSql.framework/Versions/4/QtSql.framework (architecture ppc): /usr/local/Trolltech/Qt-4.7.0/lib/QtSql.framework/Versions/4/QtSql.framework (architecture (compatibility version 4.7.0, current version 4.7.0) Version 4 of the QtGui.framework is located in /var/lib/QtGui.framework and is named QtGui.framework/Versions/4 (compatibility version 4.7.0, current version 4.7.0) Versions/4/QtNetwork (compatibility version 4.7.0, current version 4.7.0) in the /usr/local/Trolltech/Qt-4.7.0/lib/QtCore.framework/Versions/4/QtCore directory (compatibility version 4.7.0, current version 4.7.0) in the /usr/local/Trolltech/Qt-4.7.0/lib/QtCore.framework (current version 4.7.0) (compatibility version 4.7.0, current version 4.7.0) /usr/lib/libstdc+.6.dylib is a dynamic link library (compatibility version 7.0.0, current version 7.9.0) /usr/lib/libgcc s.1.dylib (compatibility version 1.0.0, current version 625.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 625.0.0) (compatibility version 1.0.0, current version 125.2.1) Every architecture should use the same libraries, which should be the case.Add the ″-arch″ argument to the otool command line to confine the output to a certain architecture: $ otool -L -arch i386 menubar.app/Contents/MacOS/menubar menubar.app/Contents/MacOS/menubar
On Windows, there is no command-line utility that can be used to display the dependencies.Instead, the graphical Dependency Walker tool (depends.exe) is utilized to complete the task at hand.Until Visual Studio Version 8.0, the utility was a part of the package (aka Visual Studio 2005).It is now available for download on the internet.It does not require the installation of any development environments and may be used on Windows 95, 98, Me, NT, 2000, XP, 2003, Vista, and Windows 7.When you load an application into the dependency walker, it will display all of the individual dlls that have been loaded, as well as their folder.
When a dll is incompatible or not accessible, errors are displayed.However, there are certain incorrect indicators provided by this technique.When the Qt creation program is launched, the output seen on the screen image below is shown.This version of Qt maker has been built using MinGW 4.6.2 and is available for download (32 bit).Unfortunately, Depends.exe reports that some dlls are missing (such as GPSVC.DLL and IESHIMS.DLL).
According to reports, the list of missing dlls is likely to expand over time as a result of Windows upgrades.The majority of the time, such dlls are not present on the system, but they are not essential for the application to function properly.Due to this, it is a little more difficult to locate other missing dll files that must be made accessible to the application.This may be accomplished by either adding the folder containing the dll to the environment path or by copying the dll into the application’s directory.TIP: Press the F9 key to display the whole path of the dll.
More detailed checking of dependencies
Depends.The exe command allows you to view where the dlls have been loaded from.The ultimate test, on the other hand, is to run the program executable in a completely blank environment.Start the command prompt (cmd.exe) (the command prompt) ″path″ is the command to use.You will most likely notice a lengthy phrase with a large number of folders from your computer.If there is only one item that contains Qt dlls, you may have a problem.
It is possible that the same thing will happen with compiler dlls.Type ″set path=″ to remove the path environment setting from the system.When you type ″path,″ you’ll get the message ″PATH=(null).″ As an illustration, consider the following output: Window’s from Microsoft Microsoft Corporation retains ownership of the copyright.All intellectual property rights are reserved.d:gt;path PATH= C:Program Files (x86)Common Files (x86)Microsoft Shared Windows Live;c:Files (x86)8.70bin;c:.8.3 MinGWbin;c:.8.3 MinGW Wlib;c:.8.3 MinGW Wlib;c:.8.3 MinGW Wlib;c:.8.3 MinGW Wlib;c:.8.3 MinGW Wlib; C:Program Files (x86)Common Files (x86)Microsoft Shared Windows Live;C:32;C:;C:32;C:32;C:32;C:32;C:32;C:32;C:32;C:32;C:32;C:32;C:32;C:3 2WindowsPowerShellv1.0 C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C:Files (x86); C C:Program Files (x86)Common Files (x86)Microsoft Shared Windows Live;C:Files (x86)FilesTeleca Shared;C:Files (x86)Leak Detectorbin;C:Files (x86)FilesRoxio SharedDLLShared;C:Files (x86)Leak Detector;C:Files (x86)Leak Detector;C:Files (x86)FilesRoxio SharedDLLShared;C:Files ( C:Files (x86)2.26.3bin;C:Program FilesMiKTeX 2.9miktexbinx64;C:Files (x86)2.26.3bin C:FilesTortoiseSVNbin;C:Files (x86); d:gt;set path= d:gt;path PATH=(null) d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;d:gt;
How to show shared library dependency in Linux
In order for a program to operate, it would normally rely on other libraries.A shared library pool might include libraries that were either built into the application or loaded from a shared library pool.The usage of shared libraries helps to minimize the overall size of the application while also making its development and deployment easier.Shared libraries are located in the /lib* or /usr/lib* directories in Linux.Different Linux distributions, or even different versions of the same distribution, may package libraries in different ways, resulting in a program that has been developed for one distribution or version not running successfully on another.Whenever the needed library is not present in the system, you will see the following error message.
dpkg -i sudo – sudo: an error occurred when loading shared libraries: libpthread.so.0: could not access shared object file: no such file or directory sudo: an error occurred while loading shared libraries Troubleshooting shared libraries loading difficulties may be accomplished by utilizing command-line tools such as ldd or other command-line tools to examine the shared libraries that a program relies on.
- Get the absolute path of the program you wish to verify by launching your chosen terminal application. $ which bash /usr/bin/bash
- print shared object dependencies using ldd
- print shared object dependencies using ldd ldd linux-vdso.so /usr/bin/bash linux-vdso.so 1 (0x00007ffdd2749000) libtinfo.so.1 (0x00007ffdd2749000) Sixty-one => /lib/x86 64-linux-gnu/libtinfo.so is the location of the library. libdl.so.6 (0x00007fcecb9b6100) is a shared library. 2 => /lib/x86 64-linux-gnu/libdl.so.2 (0x00007fcecb9b0000) libc.so.2 (0x00007fcecb9b0000) libc.so.2 (0x00007fcecb9b0000) libc.so.2 (0x00007fcecb9b0000) libc.so.2 (0x00007fcec 6 => /lib/x86 64-linux-gnu/libc.so is the location of the library. 6 (0x00007fcecb7c5000) /lib64/ld-linux-x86-64.so (0x00007fcecb7c5000) 2 (0x00007fcecbb21000)
- ldd is used to print verbose dependency information. /usr/bin/bash linux-vdso.so ldd -verbose linux-vdso.so The file libtinfo.so.1 (0x00007ffce299c000) was found. Sixty-one => /lib/x86 64-linux-gnu/libtinfo.so is the location of the library. libdl.so.6 (0x00007f6fb24dd000) is a shared library. 2 => /lib/x86 64-linux-gnu/libdl.so in the current directory. libc.so.2 (0x00007f6fb24d6100) is a shared object. 6 => /lib/x86 64-linux-gnu/libc.so is the location of the library. The number 6 (0x00007f6fb22ec000) refers to the file /lib64/ld-linux-x86-64.so.2 (0x00007f6fb2648000). The version number is: 0x00007f6fb2648000. /usr/bin/bash: libdl.so.2 (GLIBC 2.2.5) => /lib/x86 64-linux-gnu/libdl.so.2 libtinfo.so.2 /lib/x86 64-linux-gnu/libtinfo.so.2 /lib/x86 64-linux-gnu/libtinfo.so.2 /lib/x86 (NCURSES6 TINFO 5.0.19991023) => (libtinfo.so.6 libc.so.6) /lib/x86 64-linux-gnu/libtinfo.so.6 libc. 6