[SOLVED] ? on user input for bash script

[a31modela]

Ok, I am trying to muddle my way thru creating a very simple script and having a problem ignoring the case of user input.

All I want to do is take an existing script, add a piece to have the user verify they want to run the script or not.

I want to be able to have the user either input yes, YES, or any case combo & have the same result. here is a test script i was using to try it out :

#!/bin/bash

##############################
# test script for user input to run the script
#############################

echo " Are you sure you want to run this script ? Type yes or no and press [ENTER]"
read response

if [ "$response" = "yes" ]; then
ls /tmp
elif [ "$response" = "no" ]; then
echo " Taking you back to the Menu"
fi


##########################################

This works fine as is but I need to add logic to accept Yes, YES, etc.

I have tried playing with using different operands with read, tried using [Yy][eE][sS] in the $response= section, tried ==, tried alot of different options from reading different reference materials.

I think I am close but not sure what combo of operands, notation I need to do this correctly.

Thanks in advance for your help !
Steve

[HROAdmin26]

While you can play with regular expressions, I find it easier to change any input to either all lower or all upper case and then test.

How to convert a string to upper or lower case in bash?

[a31modela]

Thanks very much for the quick reply. Using your link, I was able to get what I needed. For the benefit of others, here is what the final snippet looks like. I also found out that instead of using [:upper:] [:lower:], I could have also used 'A-Z' 'a-z'.

Thanks Again !
Steve

#!/bin/bash

##############################
# test script for user input
#############################


echo -n " Are you sure you want to run this script ? Type yes or no and press [ENTER]"

read answer
answer="$(echo ${answer} | tr [:upper:] [:lower:])"

if [ "$answer" != "yes" ]; then
exit 0
fi

#############################
# Regular Script Continuation here
###########################

ls /tmp