How to find the process id from the process name ?

In linux, you have a command called pidof

This pidof command is used to find out the process id of the given process name

Example:

kamaraj@kamaraj-laptop:~/Desktop/testing$ ps -ef | grep fire
kamaraj 6380 1 26 12:20 ? 00:30:32 /usr/lib/firefox-3.0.19/firefox
kamaraj 13107 12535 0 14:17 pts/0 00:00:00 grep fire

kamaraj@kamaraj-laptop:~/Desktop/testing$ pidof firefox
6380