Running a command on all file occurences in a directory tree

[Christopher Browne]

> What I want to do is resize all of the JPGs in a long and ramified
> directory tree.  I figured something like:
> 
> find . -name *.jpg
> 
> in the top of the tree would do the trick for hitting all of the jpgs,
> but I don't know how to take the output of the above and have it do
> this:
> 
> convert $FILENAME -resize 425 $FILENAME
> 
> Basically, I don't know bash very well and need help with the syntax.
> Thanks.

There's a way of doing this inside the find command, but I'd suggest the
following:

for picture in `find . -name *.jpg`; do
  convert $picture -resize 425 $filename
done

This makes it easy to extend it to have some meaningful output...

a=1; for picture in `find . -name *.jpg`; do
  echo "Processing picture $a - $picture"
  convert $picture -resize 425 $filename
  ((a++)
done
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