How to zip and rename a directory tree

Question

I have a lot of music in a lot of directories:

./artist1/album1/*.mp3
./artist1/album2/*.mp3
./artist1/album3/*.mp3
./artist2/album1/*.mp3
./artist2/album2/*.mp3
./artist3/album1/*.mp3
./artist3/album2/*.mp3
... ...

How can I zip them to this:

./artist1/album1/*.mp3  => ./artist1-album1.tar.gz
./artist1/album2/*.mp3  => ./artist1-album2.tar.gz
./artist1/album3/*.mp3  => ./artist1-album3.tar.gz
./artist2/album1/*.mp3  => ./artist2-album1.tar.gz
./artist2/album2/*.mp3  => ./artist2-album2.tar.gz
./artist3/album1/*.mp3  => ./artist3-album1.tar.gz
./artist3/album2/*.mp3  => ./artist3-album2.tar.gz
... ...

I'd like one-line-command or a simple script.

Answer 1

tar:

for dir in */*/; do dir=${dir%/}; tar cf "${dir//\//-}.tar" "$dir"; done

zip:

for dir in */*/; do dir=${dir%/}; zip -0r "${dir//\//-}.zip" "$dir"; done

MP3 files contain already-compressed data, which cannot be compressed further - the best you would get is ~2%, and it would be many times slower - so the first example is just a tar archive.

If you still want Gzip compression, add a z option (as in tar czf) and replace .tar with .tar.gz. Similarly, the -0 option to zip disables compression - change -0r to -r to re-enable.

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${dir%/} removes the ending / from $dir

${dir//\//-} replaces all / with -