Hi,
I am new to unix could any one help me.

I need to delete unwanted old files which was 2006 and 2007 datas from a folder . I need a shell script which identifies older files whichare 6 months older and should do zip it and have backup those files and then delete all those files in unix os. This shell script should be automated one.when ever the total disc space is 80% then this shell script automatically run and old files should be cleared and space should be regained.

Thanks in advance
S. Ravichandran