unix programming getusage()

Create the program 'rusage' that will run a program provided on the command

line and then print out the resources used by the process using the system call

getrusage(). 

The timeval structure (documented in the timeradd man page):

  struct timeval {

    time_t      tv_sec;     /* seconds */

    suseconds_t tv_usec;    /* microseconds */

  };