NAME

time − time a command

SYNOPSIS

time command

DESCRIPTION

Time executes the given command, then prints the time elapsed during command execution, the time spent in the system, and the time spent in execution of the command.  Times are reported in seconds. 

On a PDP-11, the execution time varies according to the kind of memory the program happens to use.  The user time in MOS is often half what it is in core. 

Time prints times on the diagnostic output stream. 

Time is built in to csh(1), using a different output format. 

BUGS

Elapsed time is accurate to the second, while the CPU times are measured to the 100th second.  Thus the sum of the CPU times can be up to a second larger than the elapsed time. 

Time is a built-in command to csh(1), with a much different syntax.  This command is available as “/bin/time” to csh users. 

4th Berkeley Distribution  —  April 29, 1985