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[SLUG] Extracting string from a file - shell script

Hi Folks,

I am trying to extract a substring from a string found in a file.

The string is: *** End of TF0220 at Thu Jul 2 10:06:51 EST 2009 - RC = 0

and the substring I want to extract is TF0220. This is a program name and the length of this name varies. In other words I want to extract whatever is between the words "of" and "at" in a script.

How would I likely go about that please?

Kind Regards