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Does bash have a tool ?

My eventual goal is to create a personalized FAQ.
To that end I've collected all my outgoing mail which DOES NOT have "Re:" in the Subject into a single file {used standard SeaMonkey tools}.

Using a text editor's search&replace function I've placed "KEY1" at the beginning of the body of each message. Similarly, I've placed "KEY2" at the end of each body.

Searches led to <http://www.dsl.org/cookbook/cookbook_16.html> which describes tools to do word frequency tasks, primarily with bash builtins.

First I need to eliminate the irrelevant text between "KEY2" of the previous message and "KEY1" of the message of interest. It should be straight forard to do in BASIC.

But is there an already tested function for that?