mdw@git.distorted.org.uk Git - shells/blob - ushell.c

   1 /* -*-c-*-
   2  *
   3  * $Id: ushell.c,v 1.1 1999/04/20 00:19:04 mdw Exp $
   4  *
   5  * Extract a user's shell
   6  *
   7  * (c) 1999 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of ushell.
  13  *
  14  * ushell is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * ushell is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with ushell; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: ushell.c,v $
  32  * Revision 1.1  1999/04/20 00:19:04  mdw
  33  * Initial revision
  34  *
  35  */
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <errno.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <pwd.h>
  44 #include <sys/types.h>
  45 #include <unistd.h>
  46
  47 /*----- Main code ---------------------------------------------------------*/
  48
  49 static const char *quis;
  50
  51 int main(int argc, char *argv[])
  52 {
  53   struct passwd *pw;
  54
  55   /* --- Resolve the program name --- */
  56
  57   {
  58     char *p, *q;
  59     p = argv[0];
  60     for (q = argv[0]; *q; q++) {
  61       if (*q == '/')
  62         p = q + 1;
  63     }
  64     quis = p;
  65   }
  66
  67   /* --- Get the argument name --- */
  68
  69   if (argc != 2) {
  70     fprintf(stderr, "Usage: %s username\n", quis);
  71     exit(EXIT_FAILURE);
  72   }
  73
  74   /* --- Read the user information --- */
  75
  76   if ((pw = getpwnam(argv[1])) == 0) {
  77     fprintf(stderr, "%s: user `%s' doesn't exist", quis, argv[1]);
  78     exit(EXIT_FAILURE);
  79   }
  80
  81   /* --- Done --- */
  82
  83   puts(pw->pw_shell);
  84   return (0);
  85 }
  86
  87 /*----- That's all, folks -------------------------------------------------*/