Rename .JPG to .jpg recursively

find /path/to/images -name '*.JPG' -exec bash -c 'mv "$1" "${1/%.JPG/.jpg}"' -- {} \;
Recursively rename .JPG to .jpg using standard find and mv. It's generally better to use a standard tool if doing so is not much more difficult.

7
By: sorpigal
2010-01-07 15:41:17

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What Others Think

find /path/to/images -name '*.jpg' -exec rename.ul .JPG .jpg {} + rename.ul is the util-linux rename command, widely available on linux systems, possibly named just 'rename' if not overridden by perl rename (prename). Also here I use the + form of -exec instead of \; so that find will launch rename.ul on many file names at once, using many fewer process spawns. With -exec bash -c mv ... you launch a shell process which launches a mv process just to rename one file. It works, but for performance, you'd be much better off writing a shell script, which is a very standard tool.
bwoodacre · 672 weeks and 1 day ago
Thanks sorpigal. This did exactly what I needed it to. I tried the other command but it failed. Maybe I had a typo. @ bwoodacre. I should have totally used + instead of \; Dooh!
Xinerama · 628 weeks and 5 days ago
Using the "-exec" option of "find" is not a good technique. Basically while it is running a command "find" is waiting, and not 'searching' for the next file. This is why piping the output of "find" into "xargs" is a better idea. The filename gets cached by the pipeline ready for "xargs" to use when ready, while "find" continues to search. See find -exec vs xargs http://www.sunmanagers.org/pipermail/summaries/2005-March/006255.html Also look at commands like "mv_perl" whcih can rename multiple files in the one command. You can have "xargs" feed lots of files to each command, or just one one command per directory.
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