UNIX 6th Ed. - /usr/source/iolib/system.c

   1: system(str)
   2:  char *str;
   3: {
   4: int status;
   5:   if(fork() == 0)
   6:     execl("/bin/sh", "sh", "-c", str, 0);
   7:   wait(&status);
   8:   }

Defined functions