pidof is a Linux utility that returns the process ID (PID) of a running process or processes. On other operating systems, pgrep and ps are often used instead.

pidof is implemented in the same program as killall5, the Linux name for the System V killall program used by the runlevel scripts. pidof is usually a symbolic link to killall5, and the name the program is called under is what determines its behavior.

Examples:

$ pidof ntpd 
3580 3579
$ pidof emacs
22256

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