Since this is ugly clickbait, here is the "content" of the linked site:

> Create ~/.inputrc and fill it with this:

    "\e[A": history-search-backward

    "\e[B": history-search-forward

    set show-all-if-ambiguous on

    set completion-ignore-case on

> This allows you to search through your history using the up and down arrows … i.e. type "cd /" and press the up arrow and you'll search through everything in your history that starts with "cd /".