grep command

I got over 100s of HTML files in the following format:
….
…..

<PRE>
my data 1
my data 2
my data 3
my data 10000
my data N times
</PRE>
.....
..

How do I extract text between two words (<PRE> and </PRE>) in unix or linux using grep command?

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How do I find out out details about my FreeBSD based Laptop battery status and other information from command prompt? Howto do I check battery charge status at shell prompt?

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How do I see a list of all exported variables and functions under Unix bash shell?

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How do I count words using grep command under Linux / Unix like operating systems?

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I am a new Unix (OS X to be specific) user. How do I show line number while displaying the output using the grep command on Linux or Unix-like operating systems? How can I show matched lines together with their line numbers on my Terminal?

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How do I delete OR remove a single file from within a tar ball under Unix / Linux like operating systems?

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How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?

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