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Man page of PIDOF
PIDOF
Section: Linux System Administrator's Manual (8)
Updated: 01 Sep 1998
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NAME
pidof - find the process ID of a running program
SYNOPSIS
pidof
[-s]
[-c]
[-n]
[-x]
[-z]
[-o
omitpid[,omitpid...]]
[-o
omitpid[,omitpid...]...]
[-d
sep]
program
[program...]
DESCRIPTION
pidof
finds the process id's (PIDs) of the named programs.
It prints those id's on the standard output.
This program is on some systems used in run-level change scripts,
especially when the system has a System-V like rc structure.
In that case these scripts are located in /etc/rc?.d,
where ? is the runlevel.
If the system has a start-stop-daemon(8) program
that should be used instead.
OPTIONS
- -s
-
Single shot - this instructs the program to only return one pid.
- -c
-
Only return process PIDs 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.
- -n
-
Avoid
stat(2)
system function call on all binaries which are located on network
based file systems like
NFS.
Instead of using this option the variable
PIDOF_NETFS
may be set and exported.
- -q
-
Do not display matched PIDs to standard out.
Simply exit with a status of true or false to indicate whether a matching
PID was found.
- -x
-
Scripts too - this causes the program to also return process id's of
shells running the named scripts.
- -z
-
Try to detect processes which are stuck in zombie (Z) status.
Usually these processes are skipped
as trying to deal with them can cause pidof or related tools to hang.
Note: In the past pidof would ignore processes in the uninterruptable state
(D),
unless the -z flag was specified.
This is no longer the case.
The pidof program will find and report processes in the D state
whether -z is specified or not.
- -d sep
-
Tells pidof to use sep as an output separator
if more than one PID is shown.
The default separator is a space.
- -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.
EXIT STATUS
- 0
-
At least one program was found with the requested name.
- 1
-
No program was found with the requested name.
NOTES
pidof is actually the same program as killall5(8);
the program behaves according to the name under which it is called.
When pidof is invoked with a full pathname to the program it
should find the pid of,
it is reasonably safe.
Otherwise it is possible
that it returns PIDs of running programs that happen to have the same name
as the program you're after but are actually other programs.
Note that the executable name of running processes is calculated with
readlink(2),
so symbolic links to executables will also match.
Zombie processes or processes in disk sleep
(states Z and D, respectively)
are ignored,
as attempts to access the stats of these will sometimes fail.
The -z flag (see above) tells pidof to try to detect these
sleeping and zombie processes,
at the risk of failing or hanging.
SEE ALSO
shutdown(8),
init(8),
halt(8),
reboot(8),
killall5(8)
AUTHOR
Miquel van Smoorenburg
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXIT STATUS
-
- NOTES
-
- SEE ALSO
-
- AUTHOR
-
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