* NEWS: Add a line for 6.5-cvs.
[coreutils.git] / src / whoami.c
blobc4a2b5e82a635c1cb3434c04e5037751a0a4b743
1 /* whoami -- print effective userid
3 Copyright (C) 89,90, 1991-1997, 1999-2002, 2004, 2005 Free Software
4 Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Equivalent to `id -un'. */
21 /* Written by Richard Mlynarik. */
23 #include <config.h>
24 #include <stdio.h>
25 #include <sys/types.h>
26 #include <pwd.h>
27 #include <getopt.h>
29 #include "system.h"
30 #include "error.h"
31 #include "long-options.h"
32 #include "quote.h"
34 /* The official name of this program (e.g., no `g' prefix). */
35 #define PROGRAM_NAME "whoami"
37 #define AUTHORS "Richard Mlynarik"
39 /* The name this program was run with. */
40 char *program_name;
42 void
43 usage (int status)
45 if (status != EXIT_SUCCESS)
46 fprintf (stderr, _("Try `%s --help' for more information.\n"),
47 program_name);
48 else
50 printf (_("Usage: %s [OPTION]...\n"), program_name);
51 fputs (_("\
52 Print the user name associated with the current effective user ID.\n\
53 Same as id -un.\n\
54 \n\
55 "), stdout);
56 fputs (HELP_OPTION_DESCRIPTION, stdout);
57 fputs (VERSION_OPTION_DESCRIPTION, stdout);
58 printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
60 exit (status);
63 int
64 main (int argc, char **argv)
66 struct passwd *pw;
67 uid_t uid;
69 initialize_main (&argc, &argv);
70 program_name = argv[0];
71 setlocale (LC_ALL, "");
72 bindtextdomain (PACKAGE, LOCALEDIR);
73 textdomain (PACKAGE);
75 atexit (close_stdout);
77 parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
78 usage, AUTHORS, (char const *) NULL);
79 if (getopt_long (argc, argv, "", NULL, NULL) != -1)
80 usage (EXIT_FAILURE);
82 if (optind != argc)
84 error (0, 0, _("extra operand %s"), quote (argv[optind]));
85 usage (EXIT_FAILURE);
88 uid = geteuid ();
89 pw = getpwuid (uid);
90 if (pw)
92 puts (pw->pw_name);
93 exit (EXIT_SUCCESS);
95 fprintf (stderr, _("%s: cannot find name for user ID %lu\n"),
96 program_name, (unsigned long int) uid);
97 exit (EXIT_FAILURE);