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Accepted
Rilcon42
Asked: 2017-03-30 05:25:16 +0800 CST

Run command recursively through subdirectories

  • 772

I am trying to convert a bunch of images to thumbnails that might be in several subdirectories, and save a copy of the image as a thumbnail inside the subdirectory, but I can't figure out the syntax. Any advice would be welcome. 

convert test/*/*.jpg -50x50 test/*/*_thumb.jpg
bash

2 Answers

  1. A shell loop should also do:

    for file in test/*/*.jpg ; do
    new=${file%.jpg}_thumb.jpg 
    convert "$file" -resize 50x50 "$new"
done

    Or with Bash's globstar, which is better if the files can be on arbitrary directory levels: 

    shopt -s globstar
for file in test/**/*.jpg ; do ...

    ${file%.jpg} takes the value of the variable file and removes the string .jpg from the end. (see BashGuide on parameter expansions)

    • 6
  2. Best Answer

    You should use find for finding all files you need.

    find test -iname *.jpg -exec convert {} -resize 50x50 {}_thumb \;

    And then you should rename files with name *.jpg_thumb to *_thumb.jpg by using:

    find -name *.jpg_thumb -exec rename -e 's/^(.*)(.jpg)(_thumb)$/\1\3\2/' '{}' \;

    Note that -50x50 is not a legal parameter for convert. You should use -resize parameter with value 50x50 like in example above.

    • 5