[ALUG] Quick 'n' dirty warning email if disk usage low

If I want to run a script on my externally hosted server to mark me if my disk space is getting low, what's the simplest way to do it? Say I want a report if "df" reports more than 90% used, I want the script to run regularly but not send an email every time it runs if the problem hasn't worsend, and want to include the output from 'du -h' in the email? Then, once I have that sorted, what's the "best" way to do this kind of thing? Oh, and what's the best way to work out *why* I only have 1% left on my server? -- Mark Rogers More Solutions Ltd :: 0845 45 89 555