Let start with adding files. What tools are available for me to watch a directory. In an example, if a file is added to a directory I want to run a shell script that will do some conversation on the file to produce a second copy.
I just was working on something like this today - yum search inotify - here's a nice intro with an example close to what I'm using:
https://github.com/rvoicilas/inotify-tools/wiki/#info (inotifywait example 1)
I used -e create -e modify -e delete instead of -e close_wait - see the man page for events.
Very slick so far.
Josh