Say you have a bunch of subdirectories of your current working directory, all including variously named files. You want to iterate over those files and apply some Bash command.

For instance, I have folders named 01, 02, 03, …, 31 (representing days in a month), and inside each of those folders sits various files. I wish to gzip each of those files individually. Here’s how I do that with a single line in Bash:

$ for d in */; do for f in $d*; do echo "gzip ${f}";gzip ${f};done; done

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