TIME(1) BSD TIME(1)
NAME
time - time a command
SYNOPSIS
time command
DESCRIPTION
time is used to calculate the real, user, and system times elapsed while
a command is executing. The specified command is executed by the shell.
After execution is completed, time prints the following values:
real The time elapsed while executing the command.
user The number of CPU seconds spent in the program.
sys The number of CPU seconds spent in the operating system.
Times are reported in .1 second units, and are printed on standard error.
WARNINGS
This command is /bin/time. csh(1) and ksh(1) each have built-in time
functions, with different output formats.
Because real time is calculated in .1 second increments and CPU time is
calculated in .004 second increments, the sum of the CPU times may be up
to .1 second larger than the elapsed time.