Shell Programming and Scripting

I'm using Imagemagick to create thumbnails for a large directory tree. The only thing I can't see is how to get it to write the thumbnails to a "thumbs" subdirectory!

Either of these two commands from the Imagemagick site does most of the job:

Code:

find -name '*.jpg' | xargs -n1 sh -c 'convert $0 -format gif -thumbnail 160x160 thumbs/$0.gif

which gives me this error

Code:

`thumbs/./Moorpark/PCR-Workshop/03intro.jpg.gif': No such file or directory

or this one:

Code:

find * -name '*.jpg' -exec convert '{}' -format gif -thumbnail 160x160 thumbs/'{}'.gif \;

which gives me this error:

Code:

`thumbs/Moorpark/PCR-Workshop/03intro.jpg.gif': No such file or directory

Either way, that thumbs subdirectory is always assumed to be relative to the dir from which the command was executed rather than the subdir being processed. It'll process and rename files in the top level dir just fine.

How do I tell it to look for "thumbs" under the subdir it's processing? ?? I've studied the man pages, tried googling everything I could think of, tried variants I invented (that was the most hopeless of all!) and gotten nowhere.

I did manually make all those "thumbs" subdirectories. Ideally, I'd also like to be able to tell it to make that directory on the fly, but that's my next problem, unless someone has the answer.

What is so hard to understand? Convert tries to create that file and fails. Now figure out for what obvious reason.

Yeah, I already feel stupid, thanks. That's why I asked.

Perhaps try something like this...

Code:

find . -type f -name '*.jpg' |\
  while read JPG
  do
    DIR=$(dirname "$JPG")/thumbs
    THUMB=$(basename "$JPG").gif
    [[ -d "$DIR" ]] || mkdir $DIR
    convert "$JPG" -format gif -thumbnail 160x160 "$DIR/$THUMB"
  done

Ygor: thanks! Yes, that does indeed work. Now all I have to do is figure out why....

It seems to go down only one level. I.e. if I have subdirs /photos/sea/pacific and /photos/sea/atlantic it'll go through the pictures at the /photos level and the /photos/sea level, and make thumbnail dirs for those, but it ignores the next level, photos/sea/pacific or atlantic. (Not that this is an issue in real life, since I only have one subdir level.) Is that because of this part of the script
Thanks again!

Nope, sorry, I was wrong. It *is* making thumb subdirs all the way down. I got confused in my own test directory.