bash - Convert string in variable lower case -

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this question has answer here:

using bash version 3.2.57(1)-release (x86_64-apple-darwin14)

how can 're-assign' or 'change' existing value read variable.

if user inputs string iamstring, i'd propinput store value iamstring. i'm printing console example sake.

read userinput echo ${userinput} | tr '[:upper:]' '[:lower:]'

you should store output of echo :

read userinput userinput=$(echo "$userinput" | tr '[:upper:]' '[:lower:]')

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