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Thank you.

---------- Post updated at 06:32 PM ---------- Previous update was at 06:21 PM ----------

also if i want to pass a variable into a arguement of another function like expr but the...

I'm trying to check if a variable'd string is only one character and use that in an if statement the only way I could find is:
$expr "${var}" : . # expr STRING : regrep
where the "."...