TIME(1) BSD Reference Manual TIME(1)
time - time command execution
time [-l] command
The time utility executes and times command by initiating a timer and
passing the command to the shell. After the command finishes, time
writes to the standard error stream, (in seconds): the total time
elapsed, time consumed by system overhead, and the time used to execute
the command process.
-l The contents of the rusage structure are printed as well.
The csh(1) has its own and syntactically different builtin version of
time. The command described here is available as /usr/bin/time to csh
The granularity of seconds on micro processors is crude and can result in
times being reported for CPU usage which are too large by a second.
A time command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution June 6, 1993 1