Phonetic

Hey there I was wondering how to make it so that whenever someone enters a variable that i can have that variable universal so I dont have to worry about "RANDOM" or "random" being entered and they're both read the same way.

I remember seeing a simple tr [:upper:] [:lower:] command, or something like that, but I can't find an example or explanation of the statement anywhere.

Anyway, help is always appreciated. Thanks for the time spent reading this.