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How to monitor in unix (FreeBSD) /linux (CentOS 5.6) the disk space if its greater or equal to 80%?

If its equal or greater then 80%. How can i tell dump the data from a specific /misc/ folder to DVD and empty the space that was burned to DVD. So that it never cross 80% threshold?

example: * * * * * /usr/bin/php or perl /myscript

Thank you

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up vote 0 down vote accepted

Depends on your comfort level with scripting. The standard command for most flavors of Unix to check disk space is "df" The output of this could easily be integrated with a simple script that does something when df discovers a value above 80. Google will locate lots of similar things, you just have to pick a language or a shell.

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