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The real question is not what the region is when the code works or fails, but to what do the expansions of the three shell variables: com_dir, dup_file_name_chk, and save_dir expand when the code...

Note: only GNU awk and mawk can use a Regex expression for the RS variable. Other awks only take a single (leftmost) character
for RS...

An alternative that should work in any modern Posix awk...

Use \+ if you are passing files to utilities which can handle multiple files.

This is valid in both gzip and cp, and you should gain performance with small change.

Also, files with .gz...

If it's not comma-separated, it's not CSV. You've got a flatfile.

awk '{ S=""; for(N=3; N<NF; N++) S=S "_" $N ; print $1, $2, substr(S,2), $NF }' inputfile

Almost...
The H command in ed doesn't move to the beginning of the file, it tells ed that if any of the following commands fail, ed should print a textual diagnostic message (or Help message)...

But, of course, the above script only works correctly if the input fed into it always has exactly four fields in the input (and I didn't see anything in this thread so far that places any limits on...

That's most unfortunate.
You have a version of sed that does not like or support escape characters.
You do not have Perl.
What else do we have?
Do you have awk?
awk '/Apple:/{print...