time/time.1

   1 .\"     $NetBSD: time.1,v 1.7 1997/10/20 03:28:20 lukem Exp $
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  34 .\"     @(#)time.1      8.1 (Berkeley) 6/6/93
  35 .\"
  36 .Dd June 6, 1993
  37 .Dt TIME 1
  38 .Os
  39 .Sh NAME
  40 .Nm time
  41 .Nd time command execution
  42 .Sh SYNOPSIS
  43 .Nm
  44 .Op Fl lp
  45 .Ar utility
  46 .Sh DESCRIPTION
  47 The
  48 .Nm
  49 utility
  50 executes and
  51 times
  52 .Ar utility .
  53 After the
  54 .Ar utility
  55 finishes,
  56 .Nm
  57 writes the total time elapsed,
  58 the time consumed by system overhead,
  59 and the time used to execute
  60 .Ar utility
  61 to the standard error stream.
  62 Times are reported in seconds.
  63 .Pp
  64 Available options:
  65 .Bl -tag -width Ds
  66 .It Fl l
  67 The contents of the
  68 .Em rusage
  69 structure are printed.
  70 .It Fl p
  71 The output is formatted as specified by
  72 .St -p1003.2-92 .
  73 .El
  74 .Pp
  75 The
  76 .Xr csh 1
  77 has its own and syntactically different builtin version of
  78 .Nm "" .
  79 The utility described here
  80 is available as
  81 .Pa /usr/bin/time
  82 to
  83 .Xr csh
  84 users.
  85 .Sh DIAGNOSTICS
  86 The
  87 .Nm
  88 utility shall exit with one of the following values:
  89 .Bl -tag -width indent
  90 .It 1-125
  91 An error occurred in the
  92 .Nm
  93 utility.
  94 .It 126
  95 The
  96 .Ar utility
  97 was found but could not be invoked.
  98 .It 127
  99 The
 100 .Ar utility
 101 could not be found.
 102 .El
 103 .Pp
 104 Otherwise, the exit status of
 105 .Nm
 106 shall be that of
 107 .Ar utility .
 108 .Sh SEE ALSO
 109 .Xr csh 1 ,
 110 .Xr getrusage 2
 111 .Sh FILES
 112 .Bl -tag -width /usr/include/sys/resource.h -compact
 113 .It Pa /usr/include/sys/resource.h
 114 .El
 115 .Sh STANDARDS
 116 The
 117 .Nm
 118 utility conforms to
 119 .St -p1003.2-92 .
 120 .Sh BUGS
 121 The granularity of seconds on microprocessors is crude and
 122 can result in times being reported for CPU usage which are too large by
 123 a second.