git whatchanged <option>...
The command is kept primarily for historical reasons; fingers of many people who learned Git long before git log was invented by reading Linux kernel mailing list are trained to type it.
Show as patches the commits since version v2.6.12 that changed any file in the include/scsi or drivers/scsi subdirectories
git whatchanged --since="2 weeks ago" -- gitk
Show the changes during the last two weeks to the file gitk. The "--" is necessary to avoid confusion with the branch named gitk