#include <grp.h> #include <pwd.h> #include <sys/types.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> int main (int argc, char *argv[]) { uid_t me; struct passwd *my_passwd; struct group *my_group = NULL; char **members; me = getuid (); my_passwd = getpwuid (me); if (my_passwd == NULL) printf ("Cannot find user entry for UID %d\n", me); else { printf ("My login name is %s.\n", my_passwd->pw_name); printf ("My uid is %d.\n", (int)(my_passwd->pw_uid)); printf ("My home directory is %s.\n", my_passwd->pw_dir); printf ("My default shell is %s.\n", my_passwd->pw_shell); my_group = getgrgid (my_passwd->pw_gid); if (my_group == NULL) printf ("No data for group %d found\n", my_passwd->pw_gid); else { printf ("My default group is %s (%d).\n", my_group->gr_name, (int)(my_passwd->pw_gid)); printf ("The members of this group are:\n"); for (members = my_group->gr_mem; *members != NULL; ++members) printf (" %s\n", *members); } } exit (my_passwd && my_group ? EXIT_SUCCESS : EXIT_FAILURE); }