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

Hi there,

There are multiple ways of doing it, but what I personally use is the following syntax:

• Transform all letters to lower case:

echo "${user_input_variable,,}"

• Transform only the first letters to lower case:

echo "${user_input_variable,}"

• Transform all letters to upper case:

echo "${user_input_variable^^}"

• Transform only the first letter to upper case:

echo "${user_input_variable^}"

Here is a quick demo:

Hope that this helps! Regards, Bobby