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@(#)time.1 8.1 (Berkeley) 6/6/93
$FreeBSD: releng/10.2/usr.bin/time/time.1 216370 2010-12-11 08:32:16Z joel $
.Dd May 14, 2006 .Dt TIME 1 .Os .Sh NAME .Nm time .Nd time command execution .Sh SYNOPSIS .Nm .Op Fl al .Op Fl h | Fl p .Op Fl o Ar file .Ar utility Op Ar argument ... .Sh DESCRIPTION The .Nm utility executes and times the specified .Ar utility . After the .Ar utility finishes, .Nm writes to the standard error stream, (in seconds): the total time elapsed, the time used to execute the .Ar utility process and the time consumed by system overhead.
p The following options are available: l -tag -width indent 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 h Print times in a human friendly format. Times are printed in minutes, hours, etc. as appropriate. 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 Some shells may provide a builtin .Nm command which is similar or identical to this utility. Consult the .Xr builtin 1 manual page.
p If .Nm receives a .Dv SIGINFO (see the status argument for .Xr stty 1 ) signal, the current time the given command is running will be written to the standard output. .Sh ENVIRONMENT The .Ev PATH environment variable is used to locate the requested .Ar utility if the name contains no .Ql / characters. .Sh EXIT STATUS If .Ar utility could be timed successfully, its exit status is returned. If .Ar utility terminated abnormally, a warning message is output to stderr. If the .Ar utility was found but could not be run, the exit status is 126. If no .Ar utility 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 builtin 1 , .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 utility appeared in .At v3 .