Clock is a small command-line program.
As first parameter it gets the program that should be run.
The next parameters are the parameters for the program to run.
Clock resets the "stopwatch" runs the specified program with its parameters and checks when that program terminates.
It then prints the runtime from the "stopwatch".
When passing no arguments some help is given
Artificial colors. In red what the user types, in green the output generated by "clock"