Passes the name of an image to be activated in a child process.
    This function is nonreentrant.

    Format

      #include  <unistd.h>

      int execle  (char *file_spec, char *arg0, . . . , (char *)0,
                  char *envp[]); (ISO POSIX-1)

      int execle  (char *file_spec, . . . ); (Compatibility)