I have a lot of images that I would like to process with pngquant. They are organized in a pretty deep directory structure, so it is very time-consuming to manually cd into every directory and run pngquant -ext .png -force 256 *.png
Is there a way to get this command to run on every *.png in every directory within the current one, as many layers deep as necessary?
If you have limited depth of directories and not too many files, then lazy solution:
pngquant *.png */*.png */*/*.png
A standard solution:
find . -name '*.png' -exec pngquant --ext .png --force 256 {} \;
and multi-core version:
find . -name '*.png' -print0 | xargs -0 -P8 -L1 pngquant --ext .png --force 256
where -P8 defines number of CPUs, and -L1 defines a number of images to process in one pngquant call (I use -L4 for folders with a lot of small images to save on process start).
bash or zsh, and the option is enabled (shopt -s globstar in bash), you can use a recursive glob: pngquant **/*.png
find . -name '*.png' -exec pngquant --ext .png --force 256 {} \; fails with File not found - '*.png'
-L1 it adds all arguments to a single pngquant call, which processes them serially :). Fixed.
With the fish shell you can run the following from the root of your project directory
pngquant **.png
Which will generate new files with extensions like -or8.png or -fs8.png.
If you want to overwrite the existing files, you can use
pngquant **.png --ext .png --force
shopt -s globstar set, or zsh by default, etc.