How to: Find Out Whether a UNIX / Linux Process Is Running or Not
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 [email protected]
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
