Linux batch conversion: Change quality of jpg with convert but keep its name

linux imagemagick

Try this instead:

mogrify -quality 80% *.jpg

linux imagemagick

convert command help:

convert input-file [options] output-file

Now a little script to convert all jpg files to 80% quality of original under current directory

for file in *.jpg; do  convert "$file" -quality 80% "$file"done;

linux imagemagick

This will work for you.

convert -quality 80% '*.jpg' -set filename:original %t %[filename:original].jpg

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