cis-lclient06:~/class/nov22>more exec5.c
#include <syscall.h>
#include <unistd.h>
#include <stdio.h>
int main(void) {
    execl("/bin/ps", "ps", "-lax", (char *) NULL);
    printf("Only get here if execl() fails\n");
}
cis-lclient06:~/class/nov22>gcc exec5.c
cis-lclient06:~/class/nov22>./a.out
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
4     0     1     0  20   0   2924  1260 poll_s Ss   ?          0:02 /sbin/init
1     0     2     0  20   0      0     0 kthrea S    ?          0:00 [kthreadd]
1     0     3     2 -100  -      0     0 migrat S    ?          0:00 [migration/0]
...
cis-lclient06:~/class/nov22>