time - execute command and display elapsed time


C shell

time [command]

Korn shell

time pipeline


This command is a built-in command in the C Shell and the Korn Shell.

C shell

The time(1) command executes command (which must be a simple command, not an alias, a pipeline, a command list, or a parenthesized command list) and prints a time summary as described in tcsh(1) under the time variable. If necessary, an extra shell is created to print the time statistic when the command completes. Without command, prints a time summary for the current shell and its children.

Korn shell

The shell executes the pipeline and writes to standard error the elapsed time, the user time, and the system time for the command.

Redirections after pipeline affect the last command in the pipeline, not the time(1) command.