7 int main(int argc, char **argv)
9 int result, ngroups, i;
13 if (!(pw = getpwnam(argv[1]))) {
14 printf("FAIL: no passwd entry for %s\n", argv[1]);
18 result = initgroups(argv[1], pw->pw_gid);
25 ngroups = getgroups(0, NULL);
27 groups = (gid_t *)malloc(sizeof(gid_t) * ngroups);
28 ngroups = getgroups(ngroups, groups);
30 printf("%s is a member of groups:\n", argv[1]);
32 for (i = 0; i < ngroups; i++) {
35 grp = getgrgid(groups[i]);
37 printf("%d (%s)\n", groups[i], grp ? grp->gr_name : "?");