for (( ; ; )) # infinite loop
do
echo "infinite loop [CTRL+C to stop]"
done
# run:
#
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# infinite loop [CTRL+C to stop]
# ...
#