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Annotation of src/usr.bin/time/time.1, Revision 1.19

1.19    ! sobrado     1: .\"    $OpenBSD: time.1,v 1.18 2009/02/08 17:15:10 jmc Exp $
1.1       deraadt     2: .\"    $NetBSD: time.1,v 1.5 1994/12/08 09:36:57 jtc Exp $
                      3: .\"
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                      5: .\"    The Regents of the University of California.  All rights reserved.
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                      7: .\" Redistribution and use in source and binary forms, with or without
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                     10: .\" 1. Redistributions of source code must retain the above copyright
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1.12      millert    15: .\" 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    16: .\"    may be used to endorse or promote products derived from this software
                     17: .\"    without specific prior written permission.
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                     19: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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                     31: .\"     @(#)time.1     8.1 (Berkeley) 6/6/93
                     32: .\"
1.19    ! sobrado    33: .Dd $Mdocdate: February 8 2009 $
1.1       deraadt    34: .Dt TIME 1
                     35: .Os
                     36: .Sh NAME
                     37: .Nm time
                     38: .Nd time command execution
                     39: .Sh SYNOPSIS
                     40: .Nm time
                     41: .Op Fl lp
                     42: .Ar utility
1.19    ! sobrado    43: .Op Ar argument ...
1.1       deraadt    44: .Sh DESCRIPTION
1.7       aaron      45: .Nm
1.19    ! sobrado    46: executes and times
        !            47: .Ar utility
        !            48: with optional
        !            49: .Ar arguments .
1.1       deraadt    50: After the
                     51: .Ar utility
                     52: finishes,
1.7       aaron      53: .Nm
1.1       deraadt    54: writes the total time elapsed,
                     55: the time consumed by system overhead,
1.7       aaron      56: and the time used to execute
                     57: .Ar utility
1.1       deraadt    58: to the standard error stream.
                     59: Times are reported in seconds.
                     60: .Pp
1.8       aaron      61: The options are as follows:
1.1       deraadt    62: .Bl -tag -width Ds
                     63: .It Fl l
                     64: The contents of the
                     65: .Em rusage
                     66: structure are printed.
                     67: .It Fl p
                     68: The output is formatted as specified by
                     69: .St -p1003.2-92 .
                     70: .El
                     71: .Pp
                     72: The
1.7       aaron      73: .Nm
1.1       deraadt    74: utility shall exit with one of the following values:
1.10      aaron      75: .Pp
                     76: .Bl -tag -width indent -compact
1.7       aaron      77: .It 1\-125
                     78: An error occurred in the
                     79: .Nm
1.1       deraadt    80: utility.
                     81: .It 126
1.7       aaron      82: The
1.1       deraadt    83: .Ar utility
                     84: was found but could not be invoked.
                     85: .It 127
1.7       aaron      86: The
1.1       deraadt    87: .Ar utility
                     88: could not be found.
                     89: .El
                     90: .Pp
1.7       aaron      91: Otherwise, the exit status of
                     92: .Nm
                     93: shall be that of
1.1       deraadt    94: .Ar utility .
                     95: .Sh FILES
1.3       deraadt    96: .Bl -tag -width /usr/include/sys/resource.h -compact
                     97: .It Pa /usr/include/sys/resource.h
1.1       deraadt    98: .El
1.9       aaron      99: .Sh SEE ALSO
                    100: .Xr csh 1 ,
1.16      jmc       101: .Xr ksh 1 ,
1.9       aaron     102: .Xr getrusage 2
1.1       deraadt   103: .Sh STANDARDS
                    104: The
                    105: .Nm
1.14      jmc       106: utility is compliant with the
1.18      jmc       107: .St -p1003.1-2008
1.14      jmc       108: specification.
                    109: .Pp
                    110: The flag
                    111: .Op Fl l
                    112: is an extension to that specification.
1.17      jmc       113: .Pp
                    114: .Nm
                    115: also exists as a built-in to
                    116: .Xr csh 1
                    117: and
                    118: .Xr ksh 1 ,
                    119: though with a different syntax.
1.9       aaron     120: .Sh HISTORY
                    121: A
                    122: .Nm
                    123: command appeared in
1.11      mickey    124: .At v3 .
1.1       deraadt   125: .Sh BUGS
                    126: The granularity of seconds on microprocessors is crude and
                    127: can result in times being reported for CPU usage which are too large by
                    128: a second.