Write a program using fork() to create a child process. The
program takes three command line arguments. argv[1]
is the name of a standard Linux command and argv[2] is
a single argument to argv[1]. The child process executes
the command with its argument. The parent outputs the time
taken by the child process. Use the time() function (read
its man page if you do not know how to use it).
For example, if you name your program howlong, then
howlong sleep 1
executes
sleep 1 in the child process and the time taken
for execution is output by the parent process.