#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long::Descriptive;

my @users = ();
my @pwent = ();

my ($opt, $usage) = describe_options(
  '%c %o',
  [ "name|n",    "sort by name"],
  [ "date|d",    "sort by date"],
  [ "reverse|r", "reverse sorting"],
  [ 'help',      "print usage message and exit" ],
);

if ( $opt->help ) {
  print($usage->text);
  exit;
};

while( @pwent = getpwent()) {
  if( $pwent[2] >= 1000 && $pwent[2] < 65534 ) {
    push( @users, "$pwent[0]\n" );
  };
};

# sort by date kinda done by default
# maybe sort by time since last password change in /etc/shadow?

if ( $opt->name ) {
  @users = sort( @users );
};

if ( $opt->reverse ) {
  @users = reverse( @users );
};

print @users;