Show running processes in Linux

ps command

Type the following ps command to display all running process:
# ps aux | less

Where,

* -A: select all processes
* a: select all processes on a terminal, including those of other users
* x: select processes without controlling ttys

Task: see every process on the system

# ps -A
# ps -e

Task: See every process except those running as root

# ps -U root -u root -N

Task: See process run by user vivek

# ps -u vivek

Task: top command

The top program provides a dynamic real-time view of a running system.
Type the top at command prompt:
# top

To quit press q, for help press h.

Task: display a tree of processes

pstree shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a user name is specified, all process trees rooted at processes owned by that user are shown.
$ pstree

Task: Print a process tree using ps

# ps -ejH
# ps axjf

Task: Get info about threads

Type the following command:
# ps -eLf
# ps axms

Task: Get security info

Type the following command:
# ps -eo euser,ruser,suser,fuser,f,comm,label
# ps axZ
# ps -eM

Task: Save Process Snapshot to a file

Type the following command:
# top -b -n1 > /tmp/process.log
Or you can email result to yourself:
# top -b -n1 | mail -s ‘Process snapshot’ you@example.com

Task: Lookup process

Use pgrep command. pgrep looks through the currently running processes and lists the process IDs which matches the selection criteria to screen. For example display firefox process id:
$ pgrep firefox

Following command will list the process called sshd which is owned by root user.
$ pgrep -u root sshd

Source : nixCraft

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