supplementary group IDs (as returned by getgroups (2)) matches gid . RETURN VALUE The group_member ... otherwise. STANDARDS GNU. SEE ALSO getgid (2), getgroups (2), getgrouplist (3…printf("\n"); } exit(EXIT_SUCCESS); } SEE ALSO getgroups (2), setgroups (2), getgrent (3), group_memberNone. HISTORY SVr4, 4.3BSD. SEE ALSO getgroups (2), setgroups (2), credentials