Single shot - this instructs the program to only return one
Only return process ids that are running with the same root directory.
This option is ignored for non-root users, as they will be unable to check
the current root directory of processes they do not own.
Quiet mode, suppress any output and only sets the exit status
Show also processes that do not have visible command line (e.g. kernel
Scripts too - this causes the program to also return process id's of
shells running the named scripts.
Tells pidof to omit processes with that process id. The special pid
%PPID can be used to name the parent process of the pidof
program, in other words the calling shell or shell script.
Use separator as a separator put between pids. Used only when more
than one pids are printed for the program. The -d option is an
alias for this option for sysvinit pidof compatibility.