commandlinefu.com is the place to record those command-line gems that you return to again and again.
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If you add the bookmarklet to your browser's bookmarks with like say, the keyword 'cfu', you can for example type 'cfu hello' in the location bar and the %s gets replaced with 'hello'.
The bookmarklet will convert the search text to base64 for use with the commandlinefu website and will take you there. Tested with Firefox.