#!/bin/sh

##
## Mass Useradd For Linux
## This script that extracts new user data from a delimited text file,
## and automatically generates new user accounts. It generates a random
## password for each login, and exports the new logins and passwords to
## a text file.  Passwords automatically expire at first login.  The
## input file format is "username: full name" (no quotes) for each
## line.
##
## Mass Useradd creates a "User Personal Group."
## The UID and the GID are the same. User's home directories
## are created with restrictive permissions, chmod 700.
## Mass Useradd uses standard Shadow Suite utilities.
## Values and behaviors are easily modifiable, according
## to the individual utility being called.  It calls a companion
## script, mass_passwd, to set each user password.  You should
## have received mass_passwd from the same source as mass_useradd.
##
## This script was created by Aaron Malone, and modified by
## Meredydd Luff, Peter Samuelson, and Kathryn Hogg.
## Many thanks!
## Carla Schroder wrote the documentation and pestered
## the aforementioned persons to modify the original script.
## Copyright (C) 2003  Carla Schroder
## carla at bratgrrl dot com
## 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.
## http://www.fsf.org/licenses/gpl.html
##
##   Usage:
##       #  sh mass_useradd < inputfile >> new-passwords.txt
##

PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:$PATH

# Read a line of input.
# the format of the input file must be like this:
# userlogin : FirstName LastName
# to use a comma-delimited file, change IFS=":$IFS" to IFS=",$IFS"

while IFS=":$IFS" read username realname; do

# First, weed out blank lines and #comments
        case "$username" in
                '' | \#*) continue ;;
        esac

# this part reads /etc/passwd and /etc/group, and calculates
# the next available UID and GID.
# it starts at {id=1000}, change this to suit
        id=$({ getent passwd; getent group; } | cut -f3 -d: | sort -un |
             awk 'BEGIN { id=1000 }
                  $1 == id { id++ }
                  $1 > id { print id; exit }')

# Now users are added to /etc/group, /etc/passwd,
# and home directories with chmod 700 are created
# Any of the groupadd, useradd, and chmod options
# can be changed to suit
        groupadd -g $id $username
        useradd -m -c "$realname" -g $username -u $id $username
        chmod 700 /home/$username

# Set the password.  This calls another script from this toolkit,
# mass_passwd, which can be used independently.  mass_passwd outputs
# the username, password and userid.
        $(dirname $0)/mass_passwd -M $username

done