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script to monitor file size

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Hi All, Can anyone please help with the following, I'm trying to write a script(bash) that will: 1. constantly run in the background and monitor the size of a particular file. 2. When this file reaches a certain limit it will copy the contents to a new file. 3. It will then write the original file to /dev/null As mentioned above, this will be a constant process and every time the original file reaches its limit the contents will be written to a fresh new file. As you can probably tell, I am new to scripting and I kind of have an idea of how to implement some of the above steps - But I don't know how it all fits together. Any assistance would be greatly appreciated. Thank you

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