Be aware that Perl has a number of built-in functions relating to users and groups, for example: getlogin, getpwnam, getgrent. See Perl functions for fetching user and group info.

The simple code below, while perhaps not meeting your specific requirements, lists all users on a Linux box (including their home directories and other properties) by using the Perl builtin getpwent function:

use strict;
use warnings;

while ( my ($name, $passwd, $uid, $gid, $quota, $comment, $gcos,
            $home, $shell) = getpwent ) {
    print <<"ALL_USER_ATTRS";
name    = $name
passwd  = $passwd
uid     = $uid
gid     = $gid
quota   = $quota
comment = $comment
gcos    = $gcos
home    = $home
shell   = $shell

ALL_USER_ATTRS
}
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See also Re: adding a group to the Unix System for example code that calls getpwnam.