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Accepted
Reza
Asked: 2015-06-13 03:45:44 +0800 CST

How to detect files with the same name but different extensions?

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I have a directory whose files have extension either .JPG or .NEF and I want to delete the files of the form X.NEF for which X.JPG does not exist in the directory. (X here can be any string.) I don't know how to do this other than by hand.

A more general situation is when you want to find all the files in a directory A which exist in directory B as well. (The first problem can be turned into the second one using mmv.)

directory

1 Answers

  1. Best Answer

    You can use the shell's ${var%ext} parameter substitution features to remove the original extension on a per-file basis: to illustrate

    touch file{1..6}.NEF file{1,2,4,6}.JPG

    Then

    for nef in *.NEF; do [[ -f "${nef%.NEF}.JPG" ]] || echo rm -- "$nef"; done

    results in

    rm -- file3.NEF
rm -- file5.NEF

    Explanation:

    The first command just creates 6 .NEF files numbered file1.NEF to file6.NEF and corresponding .JPG files for 3 of them i.e. just some empty files to test the second command on.

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