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zsh example using a 'for' loop and arithmetic expression:
files matching the pattern '*.jpg' are renamed with a 3 digit prefix, keeping the previous filename and suffix.
There are 5 alternatives - vote for the best!
This command will take the files in a directory, rename them, and then number them from 1...N.
Black belt stuff.
Hell of a time saver.
The '1' in '%01d' changes the amounts of digits in the integer, eg. 1 vs 0001.
If you can do better, submit your command here.
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