131 lines
3.3 KiB
Groff
131 lines
3.3 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 June 6, 1993
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.Dt TIME 1
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.Os BSD 4
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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 l
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.Op Fl a
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.Op Fl o Ar file
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.Ar command
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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 command
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by initiating a timer and passing the
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.Ar command
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to the
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shell.
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After the
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.Ar command
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finishes,
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.Nm
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writes to the standard error stream,
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(in seconds):
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the total time elapsed,
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time consumed by system overhead,
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and the time used to execute the
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.Ar command
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process.
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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 l
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The contents of the
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.Em rusage
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structure are printed as well.
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.It Fl a
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If the
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.Fl o
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flag is used, append to the specified file rather than overwriting
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it. Otherwise, this option has no effect.
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.It Fl o Ar file
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Write the output to
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.Ar file
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instead of stderr. If
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.Ar file
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exists and the
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.Fl a
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flag is not specified, the file will be overwritten.
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.El
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.Sh NOTES
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.Pp
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The
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.Xr csh 1
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has its own and syntactically different builtin version of
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.Nm time .
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The command described here
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is available as
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.Pa /usr/bin/time
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to
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.Xr csh
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users.
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The output of
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.Nm
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can be directed to standard output by specifying
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.Do
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-
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.Dc
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as the argument to the
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.Fl a
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or
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.Fl o
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option.
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.Pp
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The
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.Fl a
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and
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.Fl o
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options are mutually exclusive.
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.Sh BUGS
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The granularity of seconds on micro processors 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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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr getrusage 2 ,
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.Xr wait 2
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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