Find - locating newer directories

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http://forums.fedoraforum.org – Fedora 16 (I think the release is irrelevant though) I have little space in /home and Gnome now tells me when the space runs low. So I thought I'd practise my Ruby on writing a script that determines when a directory size changes and then keeps track of the 'checked sizes' in a PostgreSQL database. To get the directories changed, I wanted to use the system 'find' - but I didn't want to scan all directories, as I'm not really that interested in things such as /proc, /sys, /mnt etc.... The Ruby script also then takes the time the script was last run and finds directories 'newer' than th (HowTos)