Bulk operations on images in Linux - How to bulk convert PDF files to PNG

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One of our clients sent us images they want to put in the website as pdf files. There were 100 files each containing a single image. Opening each of these in gimp and then saving it as pngs was a nightmare. For all such situations, ImageMagick is there for your rescue. With mogrify - a command utility available in the ImageMagick package, bulk converting all these pdf files to png was child's play.

mogrify -density 400 -format png -resize 25% *.pdf 

This converted all the files to png within seconds.