procps/pgrep.1

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.\" Manual page for pgrep / pkill.
.\" Licensed under version 2 of the GNU General Public License.
.\" Copyright 2000 Kjetil Torgrim Homme
.\"
.TH PGREP "1" "October 2012" "procps-ng" "User Commands"
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.SH NAME
pgrep, pkill \- look up or signal processes based on name and other attributes
.SH SYNOPSIS
.B pgrep
[options] pattern
.br
.B pkill
[options] pattern
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.SH DESCRIPTION
.B pgrep
looks through the currently running processes and lists the process IDs which
match the selection criteria to stdout. All the criteria have to match.
For example,
.IP
$ pgrep \-u root sshd
.PP
will only list the processes called
.B sshd
AND owned by
.BR root .
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On the other hand,
.IP
$ pgrep \-u root,daemon
.PP
will list the processes owned by
.B root
OR
.BR daemon .
.PP
.B pkill
will send the specified signal (by default
.BR SIGTERM )
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to each process instead of listing them on stdout.
.SH OPTIONS
.TP
\fB\-\fR\fIsignal\fP
.TQ
\fB\-\-signal\fR \fIsignal\fR
Defines the signal to send to each matched process. Either the numeric or
the symbolic signal name can be used.
.RB ( pkill
only.)
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.TP
\fB\-c\fR, \fB\-\-count\fR
Suppress normal output; instead print a count of matching processes. When
count does not match anything, e.g. returns zero, the command will return
non-zero value.
.TP
\fB\-d\fR, \fB\-\-delimiter\fR \fIdelimiter\fP
Sets the string used to delimit each process ID in the output (by default a
newline).
.RB ( pgrep
only.)
.TP
\fB\-f\fR, \fB\-\-full\fR
The
.I pattern
is normally only matched against the process name. When
.B \-f
is set, the full command line is used.
.TP
\fB\-g\fR, \fB\-\-pgroup\fR \fIpgrp\fP,...
Only match processes in the process group IDs listed. Process group 0 is
translated into
.BR pgrep 's
or
.BR pkill 's
own process group.
.TP
\fB\-G\fR, \fB\-\-group\fR \fIgid\fP,...
Only match processes whose real group ID is listed. Either the numerical or
symbolical value may be used.
.TP
\fB\-l\fR, \fB\-\-list\-name\fR
List the process name as well as the process ID.
.RB ( pgrep
only.)
.TP
\fB\-a\fR, \fB\-\-list\-full\fR
List the full command line as well as the process ID.
.RB ( pgrep
only.)
.TP
\fB\-n\fR, \fB\-\-newest\fR
Select only the newest (most recently started) of the matching processes.
.TP
\fB\-o\fR, \fB\-\-oldest\fR
Select only the oldest (least recently started) of the matching processes.
.TP
\fB\-P\fR, \fB\-\-parent\fR \fIppid\fP,...
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Only match processes whose parent process ID is listed.
.TP
\fB\-s\fR, \fB\-\-session\fR \fIsid\fP,...
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Only match processes whose process session ID is listed. Session ID 0
is translated into
.BR pgrep 's
or
.BR pkill 's
own session ID.
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.TP
\fB\-t\fR, \fB\-\-terminal\fR \fIterm\fP,...
Only match processes whose controlling terminal is listed. The terminal name
should be specified without the "/dev/" prefix.
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.TP
\fB\-u\fR, \fB\-\-euid\fR \fIeuid\fP,...
Only match processes whose effective user ID is listed. Either the numerical
or symbolical value may be used.
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.TP
\fB\-U\fR, \fB\-\-uid\fR \fIuid\fP,...
Only match processes whose real user ID is listed. Either the numerical or
symbolical value may be used.
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.TP
\fB\-v\fR, \fB\-\-inverse\fR\fR
Negates the matching. This option is usually used in
.BR pgrep 's
context. In
.BR pkill 's
context the short option is disabled to avoid accidental usage of the option.
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.TP
\fB\-w\fR, \fB\-\-lightweight\fR\fR
Shows all thread ids instead of pids in
.BR pgrep 's
context. In
.BR pkill 's
context this option is disabled.
.TP
\fB\-x\fR, \fB\-\-exact\fR\fR
Only match processes whose names (or command line if \-f is specified)
.B exactly
match the
.IR pattern .
.TP
\fB\-F\fR, \fB\-\-pidfile\fR \fIfile\fR
Read
.IR PID 's
from file. This option is perhaps more useful for
.B pkill
than
.BR pgrep .
.TP
\fB\-L\fR, \fB\-\-logpidfile\fR
Fail if pidfile (see -F) not locked.
.TP
\fB\-V\fR, \fB\-\-version\fR
Display version information and exit.
.TP
\fB\-h\fR, \fB\-\-help\fR
Display help and exit.
.PD
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.SH OPERANDS
.TP
.I pattern
Specifies an Extended Regular Expression for matching against the process
names or command lines.
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.SH EXAMPLES
Example 1: Find the process ID of the
.B named
daemon:
.IP
$ pgrep \-u root named
.PP
Example 2: Make
.B syslog
reread its configuration file:
.IP
$ pkill \-HUP syslogd
.PP
Example 3: Give detailed information on all
.B xterm
processes:
.IP
$ ps \-fp $(pgrep \-d, \-x xterm)
.PP
Example 4: Make all
.B netscape
processes run nicer:
.IP
$ renice +4 $(pgrep netscape)
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.SH "EXIT STATUS"
.PD 0
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.TP
0
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One or more processes matched the criteria.
.TP
1
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No processes matched.
.TP
2
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Syntax error in the command line.
.TP
3
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Fatal error: out of memory etc.
.PD
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.SH NOTES
The process name used for matching is limited to the 15 characters present in
the output of /proc/\fIpid\fP/stat. Use the \-f option to match against the
complete command line, /proc/\fIpid\fP/cmdline.
.PP
The running
.B pgrep
or
.B pkill
process will never report itself as a
match.
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.SH BUGS
The options
.B \-n
and
.B \-o
and
.B \-v
can not be combined. Let
me know if you need to do this.
.PP
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Defunct processes are reported.
.SH "SEE ALSO"
.BR ps (1),
.BR regex (7),
.BR signal (7),
.BR killall (1),
.BR skill (1),
.BR kill (1),
.BR kill (2)
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.SH STANDARDS
.B pkill
and
.B pgrep
were introduced in Sun's Solaris 7. This implementation is fully compatible.
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.SH AUTHOR
.UR kjetilho@ifi.uio.no
Kjetil Torgrim Homme
.UE
.SH "REPORTING BUGS"
Please send bug reports to
.UR procps@freelists.org
.UE