Quickly and Nicely Compress Your JPG

Just on my holidays and wanted to compress my JPGs under Linux to put them on Dropbox. Google really didn't yield anything quick 'n' dirty so I adopted the following:

mogrify -quality 75 *.jpg 

Clearly you can modify the quality parameter to your choosing. You can simply navigate to the directory containing images, run that command that will convert all your JPGs to a lower quality (remember to back them up first). 

Mogrify function is part of the ImageMagick kit so you might need to install that if that command is not found.