Running Any Previous Command
You found this neat trick and ran it, but you can’t remember it. That is frustrating. You know you can use the up and down arrows to search through your command history and try to find it, but you last ran it earlier in the week and you aren’t sure how long that will take. No worries. You can search your command history.
Type Ctrl+R at the command line to start what is called a “reverse-i search” and begin typing. Whatever you type will be matched to previously run commands, so if you know it was a cool combination of commands piped together that had sort in the middle, start typing “sort” and watch as the displayed commands from your history appear. When you find it, hit Enter and run it again.
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