Kills all processes belonging to a specific user while iterating signals.

killuser.sh

#! /bin/bash
#
# TITLE:        killuser
# AUTHOR:       Josef Gosch <[email protected]>
# DESCRIPTION:  Kills all processes belonging to a specific user.
#               Iterates signals while doing so, with a 3 second break.
#               Signal order: SIGHUP, SIGTERM, SIGINT, SIGKILL
# VERSION:      1.0

function die {
	message=$1
	echo -e "$0: $message"
	exit 1
}

usage=" Kill all processes belonging to a specific user.\n  USAGE: $0 USERNAME"

pkill=`which pkill` || die "Command 'pkill' not found."
pgrep=`which pgrep` || die "Command 'pgrep' not found."

user=$1 

if [ -z "$user" ]; then 
	die "$usage"
fi


for signal in HUP TERM INT KILL; do
	pids=`$pgrep -u $user` 
	pcount=`echo $pids | wc -w`
	if [ -z "$pids" ]; then
		break
	fi
	echo "sending SIG$signal to $pcount processes: "$pids
	$pkill -SIG$signal -u "$user" 	
	if [ "$signal" = "KILL" ]; then
		sleep 1
	else
		sleep 3
	fi
done

remaining=`$pgrep -u $user | wc -w`

if [ $remaining -eq 0 ]; then
	echo "All processes killed."
	exit 0
else
	echo -e "Failed to kill $remaining processes: "`$pgrep -u $user`
	exit 1
fi