On: look(1): lines beginning with given string

[nhaehnle]

Thanks to @climagic on Twitter, I recently learned that sort -R and shuf are not in fact the same thing. (sort -R doesn't actually shuffle...)

[cfcef → nhaehnle]

My point there was that besides being a true shuffle, 'shuf' also has an algorithmic advantage when you only need a few lines (similar to how lookup has an advantage when you only need a few).