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That entire file is an awk program. Notice the #!/usr/bin/awk -f already on the first line.
You can:

Set it executable (chmod a+x tags), and run it as ./tags
Run as: awk -f tags.awk...

you mean instead of START you can have Start, etc? This is not pretty in awk:

Replace either

$0 == "START"

with

toupper($0) == "START"



OR



/^[Ss][Tt][Aa][Rr][Tt]$/

This may be difficult without more information. You first have a START tag without an END. How do you know not to continue until reaching the end of file? Do you reset at a blank line?

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