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Simple process selection : Shows the processes for the current shell

PID – the unique process ID
TTY – terminal type that the user is logged into
TIME – amount of CPU in minutes and seconds that the process has been running
CMD – name of the command that launched the process.

Example[root@rhel7 ~]# ps
  PID TTY          TIME CMD
12330 pts/0    00:00:00 bash
21621 pts/0    00:00:00 ps

View Processes : View all the running processes use either of the following option with ps

Example[root@rhel7 ~]# ps -A
[root@rhel7 ~]# ps -e

View Processes not associated with a terminal : View all processes except both session leaders and processes not associated with a terminal

Example[root@rhel7 ~]# ps -a
  PID TTY          TIME CMD
27011 pts/0    00:00:00 man
27016 pts/0    00:00:00 less
27499 pts/1    00:00:00 ps

View all the processes except session leaders View all the processes except session leaders

Example[root@rhel7 ~]# ps -d

View all processes except those that fulfill the specified conditions (negates the selection)

Example[root@rhel7 ~]# ps -a -N
OR
[root@rhel7 ~]# ps -a --deselect

View all processes associated with this terminal

Example[root@rhel7 ~]# ps -T

View all the running processes

Example[root@rhel7 ~]# ps -r

View all processes owned by you : Processes i.e same EUID as ps which means runner of the ps command

Example[root@rhel7 ~]# ps -x

Select the process by the command name

Exampleps -C command_name

Select by group ID or name. The group ID identifies the group of the user who created the process.

Exampleps -G group_name
ps --Group group_name

View by group id

Exampleps -g group_id
ps -group group_id

View all the processes belongs to any session ID

Exampleps -s session_id
ps --sid session_id

Select by tty. This selects the processes associated with the mentioned tty

Exampleps t tty
ps -t tty
ps --tty tty

Use -f to view full-format listing

Example[tux@rhel7 ~]$ ps -af

Use -F to view Extra full format

Example[tux@rhel7 ~]$ ps -F

To view process according to user-defined format

Example[root@rhel7 ~]#  ps --format column_name
[root@rhel7 ~]#  ps -o column_name
[root@rhel7 ~]#  ps o column_name

View in BSD job control format

Example[root@rhel7 ~]# ps -j

Display BSD long format

Example[root@rhel7 ~]# ps l

Add a column of security data

Example[root@rhel7 ~]# ps -aM

View command with signal format

Example[root@rhel7 ~]# ps s 766

Display user-oriented format

Example[root@rhel7 ~]# ps u 1

Display virtual memory format

Example[root@rhel7 ~]# ps v 1

If you want to see environment of any command. Then use option **e** –

Example[root@rhel7 ~]# ps ev 766

View processes using highest memory

Exampleps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem

print a process tree

Example[root@rhel7 ~]# ps --forest -C sshd

List all threads for a particular process. Use either the -T or -L option to display threads of a process

Example[root@rhel7 ~]# ps -C sshd -L

To view only the processes running as a specific user, type the following command, where linuxize is the name of the user

Exampleps -f -U linuxize -u linuxize

To print information only about the PID and COMMAND, you would run one of the following commands

Exampleps -efo pid,comm
ps auxo pid,comm

to display the output of the ps command, one page at a time pipe it to the less command

Exampleps -ef | less

The output of the ps command can be filtered with grep . For example, to show only the process belonging to the root user you would run

Exampleps -ef | grep root

If you run the ps command without any arguments, it displays processes for the current shell

Example$ ps

Display every active process on a Linux system in generic (Unix/Linux) format

Example$ ps -A
OR
$ ps -e

Display User Running Processes

Example$ ps -x

Print All Processes Running as Root (Real and Effective ID)

Example$ ps -U root -u root

Print Process Threads

Example$ ps -fL -C httpd

Specify Custom Output Format

Example$ ps L

Display Parent and Child Processes

Example$ ps -C sshd

Troubleshoot Linux System Performance

Example$ ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head
OR
$ ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head

To kill Linux processes/unresponsive applications or any process that is consuming high CPU time

Example$ ps -A | grep -i stress

use the kill command to terminate it immediately

Example$ kill -9 2583 2584

Print Security Information

Example$ ps -eM
OR
$ ps --context

display security information in a user-defined format with this command

Example$ ps -eo  euser,ruser,suser,fuser,f,comm,label

Perform Real-time Process Monitoring Using Watch Utility

Example$ watch -n 1 'ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head'

To perform a full-format listing, add the -f or -F flag

Example$ ps -ef
OR
$ ps -eF

ps's Examples

Display User Running Processes

Print All Processes Running as Root (Real and Effective ID)

Print Process Threads

Specify Custom Output Format

Display Parent and Child Processes

Troubleshoot Linux System Performance

Print Security Information

Perform Real-time Process Monitoring Using Watch Utility

TRENDING MASTER COURSES

COMPANY

SUPPORT

ps's Examples

Display User Running Processes

Print All Processes Running as Root (Real and Effective ID)

Print Process Threads

Specify Custom Output Format

Display Parent and Child Processes

Troubleshoot Linux System Performance

Print Security Information

Perform Real-time Process Monitoring Using Watch Utility

TRENDING MASTER COURSES

COMPANY

SUPPORT

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