I need to create thumbnails from multiple .png files and would like to do this using ImageMagicks convert utility. To recursively find all files that are not thumbnails themselves, I am using the following call (split into two lines to make it readable):find . -type f -name *.png -not -name *thumb.png* \  -exec convert {} -thumbnail 200x200 {}.thumb.png \;`But this would of course create a file named a.png.thumb.png when running it on a file called a.png. How could I remove the .png extension from the second {} parameter passed to convert?
Omitting extension with find?
find;imagemagick
The easiest way to do this is to pass the {} off to a shell like sh and have the shell do it:find ... \    -exec sh -c 'convert $0 -thumbnail 200x200 ${0%.png}.thumb.png' {} \;