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Well, you could of course go ahead and ask the forum every single question that comes to your mind. I am, though, not sure if that would make the best use of your time - and our's.
cf. your last...

perl -ne '(/<NAME>(.+?)<\/NAME><STANDARD>X12<\/STANDARD>/) && print "$1 ---- "; (/<NAME>NextEnvelope<\/NAME><VALUE>(.+?)<\/VALUE>/) && print "$1\n"' file

or

perl -ne...

You need to strip the "|$rec" component off the hash key. You can use something like this in the final for-loop: s/\|\d+$//

@Adhi, click on:

UNIX for Dummies Questions & Answers - The UNIX and Linux Forums (https://www.unix.com/unix-dummies-questions-answers/)

Then click the big button that says:
...

In bash, variables are local to pipes.

Replacecat file | while read line
do
:
done
Withwhile read line
do
:
done < file