linux: image reduce size via imagemagick

to quickly reduce image file size, on a linux box, using ImageMagick

/usr/local/bin/convert -quality <quality rate> <source file> <destination file>

ex: /usr/local/bin/convert -quality 81 20140207_090514N.jpg 20140207_090514N.jpg

you can adjust quality rate as needed.

i'm sure this will work on windows' ImageMagick too ;)