## Exercise 4

Implement a C program that limits the time for which another program
may run. The first argument is the number of seconds for the time
limit (recall ‹atoi›), the remaining arguments are the program to
run along with arguments.

It is OK if the program always runs for exactly the number of
seconds given. If you wanted to quit as soon as the command ends,
you could use ‹waitpid( pid, &status, WNOHANG )› (see the man page
for more details).
