Hi I am very new to Unix Shell. I have a question:

How do you check the input value against a reqex?

For example using korn Shell:

echo "Please enter revision month: \c"
read revmon

if $revmon | egrep -c = '[A-Z]{3}[0-9]{2}"'

then
echo "OK"
else

echo "PLease re-enter a valid revision month (e.g. SEP07)"

fi

With the Korn Shell you can use this:

print -n "Please enter revision month: "
read; case $REPLY in
([A-Z][A-Z][A-Z][0-9][0-9])print OK;;
(*)print KO;;
esac

Thanks... it worked perfect.

BTW what does esac mean?

The letters of the word case reversed