Write a self-terminating shell script which doesn't hang up indefinately.

#!/usr/bin/sh

( sleep 5 ; echo Warning $0 hanging - aborted ; kill -9 $$ ) &
TIMEOUT_PID=$!

Your_Line1 ...
Your_Line2 ...
Your_Line3 ...
Your_Line4 ...
Your_Line5 ... 

# kill supervision sub-process
kill -9 $TIMEOUT_PID