Check if a variable exists in a list in Bash

Question

I am trying to write a script in bash that check the validity of a user input.
I want to match the input (say variable x) to a list of valid values.

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Answer 1

You can use (* wildcards) outside a case statement, too, if you use double brackets:

string='My string';

if [[ $string == *My* ]]
then
echo "It's there!";
fi