170 lines
3.9 KiB
Groff
170 lines
3.9 KiB
Groff
.\" $NetBSD: time.1,v 1.20 2010/05/16 07:40:13 dholland Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)time.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd January 24, 2009
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.Dt TIME 1
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.Os
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.Sh NAME
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.Nm time
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.Nd time command execution
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.Sh SYNOPSIS
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.Nm
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.Op Fl clp
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.Ar utility
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.Op Ar argument ...
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.Sh DESCRIPTION
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The
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.Nm
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utility
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executes and
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times
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.Ar utility .
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After the
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.Ar utility
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finishes,
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.Nm
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writes the total time elapsed,
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the time consumed by system overhead,
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and the time used to execute
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.Ar utility
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to the standard error stream.
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Times are reported in seconds.
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.Pp
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Available options:
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.Bl -tag -width Ds
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.It Fl c
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Displays information in the format used by the
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.Nm
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builtin of
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.Xr csh 1 .
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.It Fl l
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Lists resource utilization information.
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The contents of the
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.Ar utility
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process'
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.Em rusage
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structure are printed; see below.
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.It Fl p
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The output is formatted as specified by
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.St -p1003.2-92 .
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.El
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.Pp
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Some shells, such as
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.Xr csh 1
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and
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.Xr ksh 1 ,
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have their own and syntactically different builtin version of
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.Nm .
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The utility described here
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is available as
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.Pa /usr/bin/time
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to users of these shells.
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.Ss Resource Utilization
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If the
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.Fl l
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option is given, the following resource usage
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information is displayed
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in addition to the timing information:
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.Bl -item -offset indent -compact
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.It
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maximum resident set size
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.It
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average shared memory size
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.It
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average unshared data size
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.It
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average unshared stack size
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.It
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page reclaims
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.It
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page faults
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.It
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swaps
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.It
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block input operations
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.It
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block output operations
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.It
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messages sent
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.It
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messages received
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.It
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signals received
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.It
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voluntary context switches
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.It
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involuntary context switches
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.El
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Resource usage is the total for the execution of
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.Ar utility
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and any child processes it spawns, as per
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.Xr wait4 2 .
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.Sh EXIT STATUS
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The
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.Nm
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utility exits with one of the following values:
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.Bl -tag -width indent
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.It 1-125
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An error occurred in the
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.Nm
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utility.
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.It 126
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The
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.Ar utility
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was found but could not be invoked.
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.It 127
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The
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.Ar utility
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could not be found.
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.El
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.Pp
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Otherwise, the exit status of
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.Nm
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will be that of
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.Ar utility .
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.Sh FILES
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.Bl -tag -width \*[Lt]sys/resource.h\*[Gt] -compact
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.It \*[Lt]sys/resource.h\*[Gt]
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.El
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr ksh 1 ,
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.Xr getrusage 2
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.2-92 .
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.Sh BUGS
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The granularity of seconds on microprocessors is crude and
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can result in times being reported for CPU usage which are too large by
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a second.
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