#!/bin/sh
#
# deluser+shadow 1.1: a utility to remove users from the system with optional 
#                     shadow support.
#
# Copyright (C) 1997 hf <user987@pacbell.net>
#
#    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.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
MAILDIR="/var/spool/mail"
HOMEDIR="/home"
PASSWD="/etc/passwd"
SHADOW="/etc/shadow"  # Dont need to modify if you dont have shadow support.
UNAME="$1"
LOCKDIR="/tmp/.lockdir"         # Lockdir for shadowfile.
TMP="/tmp"                      # users' tmp dir

if [ `id -u` != "0" ]; then
 echo "you have to be root to run this."
  exit 1
 fi

if [ "" = "$1" ]; then
  echo Usage: deluser username
  exit 1
 fi
  
  echo -n "Delete $1? [n] "
  read yes

if [ "$yes" != "y" ]; then
 echo >/dev/null
 exit 1
   fi

# Check for user
if grep "^$UNAME:" $PASSWD > /dev/null; then 
 echo >/dev/null

else

  echo -n "hmm...can't seem to find that user. delete $UNAME anyway? " 
  read delete
 
if [ "$delete" != "y" ]; then
 echo >/dev/null
 exit 1
   fi
 fi

if [ "$yes" = "y" ]; then
  cp  /etc/passwd /etc/passwd.backup
  cat $PASSWD |grep -v "^$UNAME:" >/tmp/passwd.tmp
  mv -f /tmp/passwd.tmp /etc/passwd 
 
 if test -f $SHADOW; then 
   if test -d $LOCKDIR; then rm -rf $LOCKDIR
 fi
 
# This avoids leaving the shadow file vulnerable. 

   mkdir $LOCKDIR; chmod og-x $LOCKDIR 
   cat $SHADOW |grep -v "^$UNAME:" >$LOCKDIR/shadow
   chmod 600 $LOCKDIR/shadow
   mv -f $LOCKDIR/shadow $SHADOW; rm -rf $LOCKDIR 
 fi   
fi  

 echo deleting home directory...
   rm -rf $HOMEDIR/$UNAME  
 
if test -f $MAILDIR/$UNAME; then 
  echo deleting mail folder...
   rm -rf $MAILDIR/$UNAME
fi