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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Tags: centos_linux, grep_command, linux_server, ps_command, running_processes
October 19th, 2007 at 5:51 am
U can also do that without using user defined format….
ps -eaf |grep [s]sh
easy to remember than that…