File nxclean of Package nxcleanup

#!/bin/bash
#
# Usage: nxclean [-dh] USER
#
# - kills all processes of the user
# - removes all files in /tmp owned by the user
# - kills all processes matching 'nx' and $USER 
#
# please use this script carefully
#
# Urs Beyerle
#

PATH=/sbin:/bin:/usr/bin:/usr/sbin
IFS=' '

### Function
function usage () {
    cat <<EOF

    Usage: nxclean [-dh] [USER]

    Options:

      -h: Print this help screen
      -d: Debug output

    * kills all processes of the user
    * removes all files in /tmp owned by the user
    * works only for root: kills all processes matching 
      'nx' and 'USER'

    Root MUST give a username [USER] as argument. All other 
    users can run nxclean only without the [USER] argument.

    Please use this script carefully. It will kill ALL of your 
    running processes and sessions on $HOSTNAME.

EOF
exit 1
}


### Read argument

dev_null="2>/dev/null"
if [ "$1" = "-d" ]; then
    debug="-d"
    shift
fi

[ "$1" = "-h" ] && usage
[ "$1" = "--help" ] && usage

my_username=$( id -un )

if [ "$my_username" = "root" ]; then
    user=$1
else
    [ "$1" != "" ] && usage
    user=$my_username
fi    
[ "$user" = "" ] && usage


### Main 
echo
echo "I will do the following:"
echo "- find /tmp -user $user -exec rm -rf {} \;"
echo "- pkill -9 -u $user"
[ "$my_username" = "root" ] && echo "- kill all processes matching: ps wwaux | grep nx | grep $user"
echo
if [ "$my_username" = "root" ]; then
    echo "This will kill all running processes and sessions of user $user on $HOSTNAME !"
else
    echo "This will kill all your running processes and sessions on $HOSTNAME !"
fi
echo
echo -n "Do you want to continue (y/N)? "
read ans
echo

if [ "$ans" = "y" ]; then
    [ "$debug" != "" ] && echo "Run in debug mode."
    if [ "$debug" != "" ]; then
	find /tmp -user $user -exec rm -rf {} \; 
    else
	find /tmp -user $user -exec rm -rf {} \; 2>/dev/null
    fi
    if [ "$debug" != "" ]; then
	pkill -9 -u $user
    else
	pkill -9 -u $user 2>/dev/null
    fi
    if [ "$my_username" = "root" ]; then
	pids=$( ps wwaux | grep nx | grep $user | awk '{ print $2 }' )
	for pid in $pids; do
	    if [ "$debug" != "" ]; then
		kill $pid
	    else
		kill $pid 2>/dev/null
	    fi
	done
    fi
fi