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.. promptly forget that you did this, or where you put the file containing the custom shell function, etc.

Ctrl-R serves a mnemonic purpose as well.. it helps you document your workflow and processes at the shell, and not hidden in some file somewhere.

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Yeah if you can't locate code you wrote in your own home directory, I dunno what to tell you mate. I'm not here to tell you not to continue your love affair with reverse history search. Do what works for you. All I did was share the easiest way I know to persist a history item as a fn or alias.

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