commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Typing a word in terminal is easier than digging your phone out, opening your two-factor authentication app and typing the code in manually.
This alias copies the one-time code to your clipboard for 3 seconds (long enough to paste it into a web form), then restores whatever was on the clipboard beforehand.
This command works on Mac. Replace pbpaste/pbcopy with your distribution's versions.