2010-07-07

Nice bit of piping

I just made a nice little pipeline. I love the Linux shell.

cat file | tr A-Z a-z | tr -c a-z "\n" | sort | uniq -c | sort -nr

That gives a nice ordered count of the most used words in the file. It's pretty dumb -- it breaks words at anything which isn't an alphabetical character -- but it does the trick.

The first tr changes uppercase characters to lowercase, the second changes anything which isn't alphabetic to a newline. Then the words are sorted alphabetically, then uniq counts successive identical lines and outputs the count with the word, then that list is sorted numerically in descending order. Lovely.

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