cis-lclient06:~/class/nov22>more exec6.c
#include <syscall.h>
#include <unistd.h>
#include <stdio.h>
int main(void) {
    execl("/usr/bin/gcc", "gcc", "-oexec6", "exec6.c", (char *) NULL);
    printf("Only get here if execl() fails\n");
}
cis-lclient06:~/class/nov22>gcc exec6.c
cis-lclient06:~/class/nov22>ls -s exec6
ls: cannot access exec6: No such file or directory
cis-lclient06:~/class/nov22>./a.out
cis-lclient06:~/class/nov22>ls -l exec6
-rwx------ 1 stafford domain users 4828 Nov 22 10:45 exec6
cis-lclient06:~/class/nov22>exec6
cis-lclient06:~/class/nov22>