Auto-logout script for linux

linux_idleout.sh

#!/bin/sh
#
# linux_idleout.sh [idle time]
#
# Auto-logout process for telnet/ssh sessions
#

IDLE_TIME=180
LOG_FILE=/tmp/idle.out
EXEMPT_PROCESSES="app1|app2|app3|etc" # optional list of apps which can be excluded

# killproc user device
killproc()
{
        user=$1
        term=$2

        ps -ft $term | grep $user | while read line
        do
                set $line
                pid=$2

                # try a gentle kill first
                kill -15 ${pid} 2>/dev/null
                sleep 5

                # now use a hard kill if the process is still there
                kill -9 ${pid} 2>/dev/null
        done
}


#
# main start here
#

# check for optional passed idle time
if [ $# -eq 1 ]
then
        IDLE_TIME=$1
fi

# scan the process table
ps -ef | egrep ${EXEMPT_PROCESSES} | while read line
do
        # extract values from ps command
        set $line
        user=$1
        term=$6

        idle=`find /dev/${term} -mmin +${IDLE_TIME} -exec ls {} \; 2>/dev/null | wc -l`

        if [ $idle -gt 0 -a $user != "tbm" -a $user != "root" -a $user != "aradmin" ]
        then
                date >>$LOG_FILE
                echo $user $term >>$LOG_FILE

                # send a warning to the user session
                # use timeout in case the warning blocks
                timeout --signal=SIGTERM 1m banner TimeOut >/dev/${term}

                killproc $user $term
        fi
done