I have a folder with the bulk of files in it of different types, i.e .pdf,.jpg,.png,.tiff etc., but all are named with the extension .JPG. How can I rename all of them with their original extensions? i.e pdf to pdf, tiff to tiff and so on.
I can find the file type by:
file 99.jpg 99.jpg: PDF document, version 1.3 Is there any script or program with which I can do this?
You can use the MIME type found by file:
#! /usr/bin/env bash for f in ./*.JPG; do type=$(file -bi "$f") type=${type%%;*} base=${f%.*} final= case "$type" in application/pdf) final="$base".pdf ;; image/png) final="$base".png ;; image/tiff) final="$base".tiff ;; esac if [ "$final" ]; then printf '%s --> %s\n' "$f" "$final" # mv -f "$f" "$final" fi done Add more types to the case if you need to (but leave out image/jpeg, since JPEG files already have the right extension). Review the changes, then uncomment the mv line when you're happy with the results.
-filename. The -- will take care of that. ./*.JPG, file and mv will see ./-filename, not -filename. Please pay attention before "fixing" other people's posts. ./ and that's why I suggested the -- (End of options) syntax. Generate the commands without running them.
Use mimetype to generate a list of command strings, which is thereafter tweaked by GNU sed's substitute s command:
cd ~/messed/up/folder/ # go where the files are... mimetype -M --output-format 'mv "%f" "%f%m"' *.JPG | sed 's#\.[^./"]*/\([^./]*"\)$#\.\1#' If some of the file extensions look a little too mime-ish, (i.e. .jpeg instead of .jpg, etc.), then add as many s commands as needed between sed ' and s, for example:
sed 's/jpeg"$/jpg"/;s#\.[^./"]*/\([^./]*"\)$#\.\1#' Once the output looks good, run that with the GNU sed's evaluate e option. (Just put an e before the final '.) So the whole thing might look like:
cd ~/messed/up/folder/ # go where the files are... mimetype -M --output-format 'mv "%f" "%f%m"' *.JPG | sed 's/jpeg"$/jpg"/;s#\.[^./"]*/\([^./]*"\)$#\.\1#e' ls # show results