time(1) - NetBSD Manual Pages

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TIME(1)                 NetBSD General Commands Manual                 TIME(1)


NAME

     time -- time command execution


SYNOPSIS

     time [-clp] utility [argument ...]


DESCRIPTION

     The time utility executes and times utility.  After the utility finishes,
     time writes the total time elapsed, the time consumed by system overhead,
     and the time used to execute utility to the standard error stream.  Times
     are reported in seconds.

     Available options:

     -c      Displays the default csh(1) summary format.

     -l      Lists resource utilization information.  The contents of the
             utility process' rusage structure are printed, see below.

     -p      The output is formatted as specified by IEEE Std 1003.2-1992
             (``POSIX.2'').

     Some shells, such as csh(1) and ksh(1), have their own and syntactically
     different builtin version of time.  The utility described here is avail-
     able as /usr/bin/time to users of these shells.

   Resource Utilization
     If the -l option is given, the following resource usage informations are
     displayed in addition to the timing information:
           maximum resident set size
           average shared memory size
           average unshared data size
           average unshared stack size
           page reclaims
           page faults
           swaps
           block input operations
           block output operations
           messages sent
           messages received
           signals received
           voluntary context switches
           involuntary context switches


EXIT STATUS

     The time utility exits with one of the following values:

     1-125   An error occurred in the time utility.

     126     The utility was found but could not be invoked.

     127     The utility could not be found.

     Otherwise, the exit status of time will be that of utility.


FILES

     <sys/resource.h>


SEE ALSO

     csh(1), ksh(1), getrusage(2)


STANDARDS

     The time utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').


BUGS

     The granularity of seconds on microprocessors is crude and can result in
     times being reported for CPU usage which are too large by a second.

NetBSD 5.0                     January 24, 2009                     NetBSD 5.0