how to pick random file name from a list of filenames in a text file.
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i want some way to pick a random name from this fi.txt.
how to do it in bash shell scripting?
Just take the first line when sorted randomly:
sort -R fi.txt | head -n 1
You can pipe that through cut if you want just the filename.
Of course, this isn't truly random since it hashes the keys, so you will get the same chance of each file regardless of the number of times it occurs. Also, it's only pseudorandom, as are all answers not seeding from /dev/urandom.
Ouch! Sorting is one of the most expensive operations possible.
Ah, but it's easier to read.
And depending on the size of the list of files, speed may not be an issue. Slow but readable and reliable is sometimes better than highly optimised, and if speed were essential then I would be using C or assemblerů