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Annotation of src/usr.bin/time/time.1, Revision 1.17

1.17    ! jmc         1: .\"    $OpenBSD: time.1,v 1.16 2009/01/06 23:29:03 jmc Exp $
1.1       deraadt     2: .\"    $NetBSD: time.1,v 1.5 1994/12/08 09:36:57 jtc Exp $
                      3: .\"
                      4: .\" Copyright (c) 1980, 1991, 1993
                      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
                      8: .\" modification, are permitted provided that the following conditions
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                     10: .\" 1. Redistributions of source code must retain the above copyright
                     11: .\"    notice, this list of conditions and the following disclaimer.
                     12: .\" 2. Redistributions in binary form must reproduce the above copyright
                     13: .\"    notice, this list of conditions and the following disclaimer in the
                     14: .\"    documentation and/or other materials provided with the distribution.
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: .\"
1.17    ! jmc        33: .Dd $Mdocdate: January 6 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
                     43: .Sh DESCRIPTION
1.7       aaron      44: .Nm
1.1       deraadt    45: executes and
                     46: times
                     47: .Ar utility .
                     48: After the
                     49: .Ar utility
                     50: finishes,
1.7       aaron      51: .Nm
1.1       deraadt    52: writes the total time elapsed,
                     53: the time consumed by system overhead,
1.7       aaron      54: and the time used to execute
                     55: .Ar utility
1.1       deraadt    56: to the standard error stream.
                     57: Times are reported in seconds.
                     58: .Pp
1.8       aaron      59: The options are as follows:
1.1       deraadt    60: .Bl -tag -width Ds
                     61: .It Fl l
                     62: The contents of the
                     63: .Em rusage
                     64: structure are printed.
                     65: .It Fl p
                     66: The output is formatted as specified by
                     67: .St -p1003.2-92 .
                     68: .El
                     69: .Pp
                     70: The
1.7       aaron      71: .Nm
1.1       deraadt    72: utility shall exit with one of the following values:
1.10      aaron      73: .Pp
                     74: .Bl -tag -width indent -compact
1.7       aaron      75: .It 1\-125
                     76: An error occurred in the
                     77: .Nm
1.1       deraadt    78: utility.
                     79: .It 126
1.7       aaron      80: The
1.1       deraadt    81: .Ar utility
                     82: was found but could not be invoked.
                     83: .It 127
1.7       aaron      84: The
1.1       deraadt    85: .Ar utility
                     86: could not be found.
                     87: .El
                     88: .Pp
1.7       aaron      89: Otherwise, the exit status of
                     90: .Nm
                     91: shall be that of
1.1       deraadt    92: .Ar utility .
                     93: .Sh FILES
1.3       deraadt    94: .Bl -tag -width /usr/include/sys/resource.h -compact
                     95: .It Pa /usr/include/sys/resource.h
1.1       deraadt    96: .El
1.9       aaron      97: .Sh SEE ALSO
                     98: .Xr csh 1 ,
1.16      jmc        99: .Xr ksh 1 ,
1.9       aaron     100: .Xr getrusage 2
1.1       deraadt   101: .Sh STANDARDS
                    102: The
                    103: .Nm
1.14      jmc       104: utility is compliant with the
                    105: .St -p1003.1-2004
                    106: specification.
                    107: .Pp
                    108: The flag
                    109: .Op Fl l
                    110: is an extension to that specification.
1.17    ! jmc       111: .Pp
        !           112: .Nm
        !           113: also exists as a built-in to
        !           114: .Xr csh 1
        !           115: and
        !           116: .Xr ksh 1 ,
        !           117: though with a different syntax.
1.9       aaron     118: .Sh HISTORY
                    119: A
                    120: .Nm
                    121: command appeared in
1.11      mickey    122: .At v3 .
1.1       deraadt   123: .Sh BUGS
                    124: The granularity of seconds on microprocessors is crude and
                    125: can result in times being reported for CPU usage which are too large by
                    126: a second.