#!/bin/bash
#Filename: user_adm.sh
#Description: A user administration tool

function usage()
{
	echo Usage:
	echo Add a new user
	echo $0 -adduser username password
	echo
	echo Remove an existing user
	echo $0 -deluser username
	echo
	echo Set the default shell for the user
	echo $0 -shell username SHELL_PATH
	echo
	echo Suspend a user account
	echo $0 -disable username
	echo
	echo Enable a suspended user account
	echo $0 -enable username
	echo
	echo Set expiry date for user account
	echo $0 -expiry DATE 
	echo
	echo Change password for user account
	echo $0 -passwd username
	echo
	echo Create a new user group
	echo $0 -newgroup groupname
	echo
	echo Remove an exisitng user group
	echo $0 -delgroup groupname
	echo
	echo Add a user to a group
	echo $0 -addgroup username groupname
	echo
	echo Show details about a user
	echo $0 -details username
	echo
	echo Show usage
	echo $0 -usage
	echo

	exit
}

if [ $UID -ne 0 ];
then
	echo Run $0 as root.
	exit 2
fi

case $1 in

	-adduser) [ $# -ne 3 ] && usage ; useradd $2 -p $3 ;; 
	-deluser) [ $# -ne 2 ] && usage ; deluser $2 ;;
	-shell)	  [ $# -ne 3 ] && usage ; chsh $2 -s $3 ;;
	-disable) [ $# -ne 2 ] && usage ; usermod -L $2 ;; 
	-enable) [ $# -ne 2 ] && usage ; usermod -U $2  ;;
	-expiry) [ $# -ne 3 ] && usage ; chage $2 -E $3 ;;
	-passwd) [ $# -ne 2 ] && usage ; passwd $2 ;;
	-newgroup) [ $# -ne 2 ] && usage ; addgroup $2 ;;
	-delgroup) [ $# -ne 2 ] && usage ; delgroup $2 ;;
	-addgroup) [ $# -ne 3 ] && usage ; addgroup $2 $3 ;;
	-details) [ $# -ne 2 ] && usage ; finger $2 ; chage -l $2 ;;
	-usage) usage ;
esac