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[shells] / ushell.c

/* -*-c-*-
 *
 * $Id$
 *
 * Extract a user's shell
 *
 * (c) 1999 Mark Wooding
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>

/*----- Main code ---------------------------------------------------------*/

static const char *quis;

int main(int argc, char *argv[])
{
  struct passwd *pw;

  /* --- Resolve the program name --- */

  {
    char *p, *q;
    p = argv[0];
    for (q = argv[0]; *q; q++) {
      if (*q == '/')
	p = q + 1;
    }
    quis = p;
  }

  /* --- Get the argument name --- */

  if (argc != 2) {
    fprintf(stderr, "Usage: %s username\n", quis);
    exit(EXIT_FAILURE);
  }

  /* --- Read the user information --- */

  if ((pw = getpwnam(argv[1])) == 0) {
    fprintf(stderr, "%s: user `%s' doesn't exist", quis, argv[1]);
    exit(EXIT_FAILURE);
  }

  /* --- Done --- */

  puts(pw->pw_shell);
  return (0);
}

/*----- That's all, folks -------------------------------------------------*/