Knowledge is Power!
^foo^bar was also new to me: This runs the previous command but with bar replacing foo. This won't always be faster than just recalling the command and editing it, but it's a useful trick.
Possibly more useful is that the default argument is empty. So if you typo a command with an extra letter, you can rerun it with this. For example, ssh myxcomputer, recalled by ^x, would run as ssh mycomputer. Note that it changes only the first occurrence, so it can also be useful in fixing doubled-up letter typos.
There's plenty more useful stuff at the web site. It's well worth checking out and contributing to. You can even get new additions sent to you via Twitter.
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