mogrify -resize 640x480 *.jpg
To change the quality of jpg:
mogrify -quality 80 *JPG
The commands can be combined:
mogrify -quality 80 -resize 640x480 *JPG
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.