How can I make this code case insensitive?

Question

如何使此代码不区分大小写？

test "${string#*$word}" != "$string" && echo "$word found in $string

Answer 1

You can use tr to convert both strings to the same case and then compare them.

Example: echo $string | tr '[:upper:]' '[:lower:]' echo $string | tr '[:upper:]' '[:lower:]'