#include <stdio.h>
#include <stdlib.h>
#include <grp.h>

int
main(void)
{
    struct group *grp;

    setgrent();
    while ((grp = getgrent()) != NULL)
        printf("%5ld %s\n", (long) grp->gr_gid, grp->gr_name);
    endgrent();

    exit(EXIT_SUCCESS);
}