Filesystem getting full. Need a monitoring script

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http://www.unix.com – Hi, I am new to shell scripting in unix HP-UX. I need to determine how much a perticular file system is full and if it goes over 80% it should notify through mail about which are the files which are greater than 1 GB size. I used df -k command it is showing the alloocated KB and the %used in that FS. But how to get it through script and find the files > 1 GB. Can anybody advise? (HowTos)