CODEWITHSUNDEEP
bashshell
Kevin
Kevin

Reputation: 1

Keep looping if the input is invalid

I'm a newbie to shell scripting and a beginner in programming. I have a scenario here that i would like to ask. I had part of the script pasted below, it is part of a case switch.

echo -n "Delete Source File After Encryption : [Y|N] "
read DSFE

if [ $DSFE = "Y" -o $DSFE = "y" ]; then
  Do something;
  clear

elif [ $DSFE = "N" -o $DSFE = "n" ]; then 
  Do something;
  clear

I like to find out how I can code the above snippet so that if the user input is not Y or N, it will loop and prompt the question.

Any comment on this mattter?

Thank you.

Regards, Kevin

Upvotes: 0

Views: 445

Answers (1)

Adrian Frühwirth
Adrian Frühwirth

Reputation: 45526

until [[ $DSFE == [YyNn] ]]; do
        read -p "Delete Source File After Encryption? [Y|N] " DSFE
done

case $DSFE in
        [Yy]) do_something ;;
        [Nn]) do_something_else ;;
        *)    # this code should not be reached
esac

Upvotes: 1

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