passwd.c

/**
   @file      passwd.c
   @author    Mitch Richling <http://www.mitchr.me/>
   @Copyright Copyright 1995 by Mitch Richling.  All rights reserved.
   @brief     UNIX password queries@EOL
   @Keywords  UNIX password user uid gid 
   @Std       ISOC POSIX UNIX98 BSD4.3 SYSV3

              This is an example program intended to illustrate how to
              query most UNIX versions for password information.  This
              has been tested on Solaris, Linux, FreeBSD, and MacOS X.
              This will not extract shadow information found in many
              UNIX versions including Solaris.

   @Tested    
              - Solaris 2.8
              - MacOS X.2
              - Linux (RH 7.3)

*/

#include <pwd.h>                /* UNIX passwd     POSIX */
#include <sys/types.h>          /* UNIX types      POSIX */
#include <stdlib.h>             /* Standard Lib    ISOC  */
#include <unistd.h>             /* UNIX std stf    POSIX */
#include <stdio.h>              /* I/O lib         ISOC  */

int main(int argc, char *argv[]);

int main(int argc, char *argv[]) {
  struct passwd *pwEnt;
  int i = 0;

  while(NULL != (pwEnt = getpwent())) {
    i++;
    printf("User #%05d: %s:%s:%ld:%ld:%s:%s:%s\n", i, pwEnt->pw_name,
           pwEnt->pw_passwd, (long)pwEnt->pw_uid, (long)pwEnt->pw_gid, pwEnt->pw_gecos, pwEnt->pw_dir, pwEnt->pw_shell);
  } /* end while */

  return 0;
} /* end func main */