man 1 pidof

PIDOF(1)                         User Commands                        PIDOF(1)

NAME
       pidof -- find the process ID of a running program

SYNOPSIS
       pidof  [-s] [-c] [-q] [-w] [-x] [-o omitpid[,omitpid...]...]  [-S sepa-
       rator] program [program...]

DESCRIPTION
       Pidof finds the process id's (pids) of the named  programs.  It  prints
       those id's on the standard output.

OPTIONS
       -s     Single shot - this instructs the program to only return one pid.

       -c     Only  return process ids that are running with the same root di-
              rectory.  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.

       -q     Quiet mode, suppress any output and only sets  the  exit  status
              accordingly.

       -w     Show  also processes that do not have visible command line (e.g.
              kernel worker threads).

       -x     Scripts too - this causes the program  to  also  return  process
              id's of shells running the named scripts.

       -o omitpid
              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.

       -S separator
              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.

EXIT STATUS
       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

BUGS
       When  using the -x option, pidof only has a simple method for detecting
       scripts and will miss scripts that, for example, use env. This  limita-
       tion is due to how the scripts look in the proc filesystem.

SEE ALSO
       pgrep(1), pkill(1)

AUTHOR
       Jaromir Capik <jcapik@redhat.com> 

                                  2020-12-22                          PIDOF(1)