~/.inputrc and /etc/inputrc

By OK -
/etc/inputrc and ~/.inputrc are used by GNU readline facility (used by bash and many other utilities to read a line of text from the terminal) to control how readline behaves.

useful bash option to know is
set completion-ignore-case On
which means that when you type cd foo and press the Tab key, if there is no foo* directory, the shell will search without case, so that any directories named Foo*, fOo* or fOO* will match. 

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