b067ecc886
Often pidof is used in shell scripts in this form:
if pidof daemon >/dev/null; then
...
fi
The redirection to /dev/null is needed because otherwise the script
would output the found PIDs.
Let's add a -q option which, similary to grep, just sets the exit code.
Also exit on first match, as there is no reason to proceed further when
at least a process is matched.
Tested with:
$ ./pidof bash
17701 14019 5276 2967
$ echo $?
0
$ ./pidof bashx
$ echo $?
1
$ ./pidof -q bash
$ echo $?
0
$ ./pidof -q bashx
$ echo $?
1
83 lines
2.6 KiB
Groff
83 lines
2.6 KiB
Groff
'\" -*- coding: UTF-8 -*-
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.\" Copyright (C) 1998 Miquel van Smoorenburg.
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.TH PIDOF 1 "2020-12-22" "" "User Commands"
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.SH NAME
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pidof -- find the process ID of a running program
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.SH SYNOPSIS
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.B pidof
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.RB [ \-s ]
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.RB [ \-c ]
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.RB [ \-q ]
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.RB [ \-w ]
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.RB [ \-x ]
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.RB [ \-o
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.IR omitpid[,omitpid...]... ]
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.RB [ \-S
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.IR separator ]
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.B program
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.RB [ program... ]
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.SH DESCRIPTION
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.B Pidof
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finds the process id's (pids) of the named programs. It prints those
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id's on the standard output.
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.SH OPTIONS
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.IP \-s
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Single shot - this instructs the program to only return one \fIpid\fP.
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.IP \-c
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Only return process ids that are running with the same root directory.
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This option is ignored for non-root users, as they will be unable to check
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the current root directory of processes they do not own.
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.IP \-q
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Quiet mode, suppress any output and only sets the exit status accordingly.
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.IP \-w
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Show also processes that do not have visible command line (e.g. kernel
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worker threads).
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.IP \-x
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Scripts too - this causes the program to also return process id's of
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shells running the named scripts.
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.IP "-o \fIomitpid\fP"
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Tells \fIpidof\fP to omit processes with that process id. The special
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pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
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program, in other words the calling shell or shell script.
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.IP "-S \fIseparator\fP"
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Use \fIseparator\fP as a separator put between pids. Used only when
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more than one pids are printed for the program.
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The \fB\-d\fR option is an alias for this option for sysvinit
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.B pidof
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compatibility.
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.SH "EXIT STATUS"
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.TP
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.B 0
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At least one program was found with the requested name.
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.TP
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.B 1
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No program was found with the requested name.
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.SH BUGS
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When using the \fI\-x\fP option,
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.B pidof
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only has a simple method for detecting scripts and will miss scripts that,
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for example, use env. This limitation is due to how the scripts look in
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the proc filesystem.
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.SH SEE ALSO
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.BR pgrep (1),
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.BR pkill (1)
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.SH AUTHOR
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Jaromir Capik <jcapik@redhat.com>
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