how to check if a string contains a substring in bash
You can use Marcus’s answer (* wildcards) outside a case statement, too, if you use double brackets:
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string='My long string'
if [[ $string == *"My long"* ]]; then
echo "It's there!"
fi
Note that spaces in the needle string need to be placed between double quotes, and the * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.
If you prefer the regex approach:
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string='My string';
if [[ $string =~ "My" ]]
then
echo "It's there!"
fi