Install Jpegptim
$ apt-get install jpegoptim
Optimize one file with Jpegptim
$ jpegoptim file.jpg --strip-all
Optimize all files with Jpegptim in directory
$ jpegoptim *.jpg --strip-all
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Install Jpegptim
$ apt-get install jpegoptim
Optimize one file with Jpegptim
$ jpegoptim file.jpg --strip-all
Optimize all files with Jpegptim in directory
$ jpegoptim *.jpg --strip-all