text: /*
      exec1. 
      shows how easy it is for a program to run a program
  */
  #include <stdio.h>
  #include <unistd.h>
  
  int main() {
      char *arglist[3];
  
      arglist[0] = "ls";
      arglist[1] = "-l";
      arglist[2] = NULL;
  
      printf("About to exec ls -l\n");
      execvp("ls", arglist);
      printf("ls is done\n");
      return 0;
  }