According to Wikipedia,
inotify is a Linux kernel subsystem which notices changes to the file system. It replaced the previous dnotify.
From what I understand about inotify, the OS is "told" that a file has been changed, instead of requiring the OS to "go looking" for changes.
I assume that there is an "inotify" file created in every directory. Is this correct? Is there a way to interact with inotify from the command line?