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How to: Find Out Whether a UNIX / Linux Process Is Running or Not

Posted by Vivek Gite [Last updated: October 18, 2007]

Q. I'd like to find out if httpd / mysqld or sshd process is running or not under CentOS Linux server. How do I determine whether a process is running or not?

A. You need to use following commands:

[a] ps - It report a snapshot of the current processes

[b] grep - Filter out process names

Find out if sshd is Process is Running or Not

Type the following command at shell prompt:
$ ps -ewwo pid,args | grep [s]sh
Output:

5341 /usr/sbin/sshd
 5864 /usr/bin/ssh-agent x-session-manager
 6289 ssh oldbox
 7126 ssh admin@core.r1.vsnl.router

Where,

  • ps : Command name
  • -ewwo pid,args : -e option force to select all running processes. -o option is used to specify user-defined format. In our case we are forcing to display only program pid and its arguments. Finally -w option specifies wide output. Use this option twice for unlimited width.
  • grep [s]sh : We are just filtering out sshd string

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Discussion on This FAQ

  1. Ganesh Says:

    U can also do that without using user defined format….

    ps -eaf |grep [s]sh

    easy to remember than that…

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