FreeBSD 4.11 manual page repository

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time - time command execution

 

NAME

      time - time command execution
 

SYNOPSIS

      time [-al] [-h | -p] [-o file] utility [argument ...]
 

DESCRIPTION

      The time utility executes and times the specified utility.  After the
      utility finishes, time writes to the standard error stream, (in seconds):
      the total time elapsed, the time used to execute the utility process and
      the time consumed by system overhead.
 
      Available options:
 
      -a      If the -o flag is used, append to the specified file rather than
              overwriting it.  Otherwise, this option has no effect.
 
      -h      Print times in a human friendly format.  Times are printed in
              minutes, hours, etc. as appropriate.
 
      -l      The contents of the rusage structure are printed as well.
 
      -o file
              Write the output to file instead of stderr.  If file exists and
              the -a flag is not specified, the file will be overwritten.
 
      -p      Makes time output POSIX.2 compliant (each time is printed on its
              own line).
 
      Some shells may provide a builtin time command which is similar or iden‐
      tical to this utility.  Consult the builtin(1) manual page.
 

DIAGNOSTICS

      If utility could be timed successfully, its exit status is returned.  If
      utility terminated abnormally, a warning message is output to stderr.  If
      the utility was found but could not be run, the exit status is 126.  If
      no utility could be found at all, the exit status is 127.  If time
      encounters any other error, the exit status is between 1 and 125
      included.
      builtin(1), csh(1), getrusage(2), wait(2)
 

STANDARDS

      The time utility is expected to conform to ISO/IEC 9945-2:1993
      (‘‘POSIX’’).
 

HISTORY

      A time command appeared in Version 3 AT&T UNIX.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.