Batch conversion of image files

Many times, I need to batch convert some files from one format into another. Usually this can be done with a nice one liner:

for i in `ls *.jpg|awk -F. '{print $1}'`; do convert $i.jpg $i.bmp; done

(converts all .jpg files into .bmp files in the current directory)

Note: you'll need imagemagick for this to work