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@(#)time.1 8.1 (Berkeley) 6/6/93
$Id$
.Dd June 6, 1993 .Dt TIME 1 .Os BSD 4 .Sh NAME .Nm time .Nd time command execution .Sh SYNOPSIS .Nm .Op Fl alp .Op Fl o Ar file .Ar command .Sh DESCRIPTION The .Nm utility executes and times .Ar command by initiating a timer and passing the .Ar command to the shell. After the .Ar command finishes, .Nm writes to the standard error stream, (in seconds): the total time elapsed, the time used to execute the .Ar command process and the time consumed by system overhead.
p Available options: l -tag -width Ds t Fl a If the .Fl o flag is used, append to the specified file rather than overwriting it. Otherwise, this option has no effect. t Fl l The contents of the .Em rusage structure are printed as well. t Fl o Ar file Write the output to .Ar file instead of stderr. If .Ar file exists and the .Fl a flag is not specified, the file will be overwritten. t Fl p Makes .Nm output POSIX.2 compliant (each time is printed on its own line). .El
p Most shells (including .Xr csh 1 ) have their own and syntactically different builtin version of .Nm time . The command described here is available as
a /usr/bin/time to users of those shells. .Sh DIAGNOSTICS If .Ar command could be timed successfully, its exit status is returned. In case .Ar command terminated abnormally, a warning message is output to stderr. If the .Ar command was found but could not be run, the exit status is 126. If no .Ar command could be found at all, the exit status is 127. If .Nm encounters any other error, the exit status is between 1 and 125 included. .Sh SEE ALSO .Xr csh 1 , .Xr getrusage 2 , .Xr wait 2 .Sh STANDARDS The .Nm utility is expected to conform to ISO/IEC 9945-2:1993 (``POSIX''). .Sh HISTORY A .Nm command appeared in .At v6 .