.\"	$OpenBSD: time.1,v 1.15 2007/05/31 19:20:17 jmc Exp $
.\"	$NetBSD: time.1,v 1.5 1994/12/08 09:36:57 jtc Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
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.\"     @(#)time.1	8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt TIME 1
.Os
.Sh NAME
.Nm time
.Nd time command execution
.Sh SYNOPSIS
.Nm time
.Op Fl lp
.Ar utility
.Sh DESCRIPTION
.Nm
executes and
times
.Ar utility .
After the
.Ar utility
finishes,
.Nm
writes the total time elapsed,
the time consumed by system overhead,
and the time used to execute
.Ar utility
to the standard error stream.
Times are reported in seconds.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl l
The contents of the
.Em rusage
structure are printed.
.It Fl p
The output is formatted as specified by
.St -p1003.2-92 .
.El
.Pp
The
.Nm
utility exists as a built-in to most shells,
although they may be syntactically different.
The utility described here is available as
.Pa /usr/bin/time .
.Pp
The
.Nm
utility shall exit with one of the following values:
.Pp
.Bl -tag -width indent -compact
.It 1\-125
An error occurred in the
.Nm
utility.
.It 126
The
.Ar utility
was found but could not be invoked.
.It 127
The
.Ar utility
could not be found.
.El
.Pp
Otherwise, the exit status of
.Nm
shall be that of
.Ar utility .
.Sh FILES
.Bl -tag -width /usr/include/sys/resource.h -compact
.It Pa /usr/include/sys/resource.h
.El
.Sh SEE ALSO
.Xr csh 1 ,
.Xr sh 1 ,
.Xr getrusage 2
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2004
specification.
.Pp
The flag
.Op Fl l
is an extension to that specification.
.Sh HISTORY
A
.Nm
command appeared in
.At v3 .
.Sh BUGS
The granularity of seconds on microprocessors is crude and
can result in times being reported for CPU usage which are too large by
a second.