42-deleteuser

#!/bin/bash

## deleteuser--Deletes a user account without a trace...
#              Not for use with OS X

homedir="/home"
pwfile="/etc/passwd"            
shadow="/etc/shadow"
newpwfile="/etc/passwd.new"     
newshadow="/etc/shadow.new"
locker="/etc/passwd.lock"

if [ -z $1 ] ; then
  echo "Usage: $0 account" >&2; exit 1
elif [ "$(whoami)" != "root" ] ; then
  echo "Error: you must be 'root' to run this command.">&2; exit 1
fi

suspenduser $1    # Suspend their account while we do the dirty work.

uid="$(grep -E "^${1}:" $pwfile | cut -d: -f3)"

if [ -z $uid ] ; then
 echo "Error: no account $1 found in $pwfile" >&2; exit 1
fi

# Remove from the password and shadow files.
grep -vE "^${1}:" $pwfile > $newpwfile
grep -vE "^${1}:" $shadow > $newshadow

lockcmd="$(which lockfile)"             # Find lockfile app in the path.
if [ ! -z $lockcmd ] ; then             # let's use the system lockfile
  eval $lockcmd -r 15 $locker 
else                                    # Ulp, let's do it ourselves.
  while [ -e $locker ] ; do
    echo "waiting for the password file" ; sleep 1
  done
  touch $locker                         # created a file-based lock
fi

mv $newpwfile $pwfile 
mv $newshadow $shadow 
rm -f $locker                           # click! unlocked again

chmod 644 $pwfile
chmod 400 $shadow

# Now remove home directory and list anything left...
rm -rf $homedir/$1

echo "Files still left to remove (if any):"
find / -uid $uid -print 2>/dev/null | sed 's/^/  /'

echo ""
echo "Account $1 (uid $uid) has been deleted, and their home directory "
echo "($homedir/$1) has been removed."

exit 0