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To avoid having a filename in one file like file1 match longer names in the other file like file10, file101, etc. and to speed things up a little bit, you might want to try:
grep -vFxf file1.txt...

I give up. You say you're not getting any errors! When I try running your code, I get the following diagnostic messages from ksh:
tester: line 4: to: not found
from: can't read /var/mail/=...

Would a neater way be to test if the file is null or not? Does it really depend if you file has data or not? If you file does not have separate records and/or one at the end, you might still get...

Excel will gladly open .csv files (usually "," delimited) or .txt file (tab) delimited.
drl pointed out why it is a security no-no to try using proprietary windows formats that support embedded ...

Hi.

Regarding email enclosures and attachments, from a recent security newsletter:

--Malicious Macros in Word Documents
(March 14, 2016)
Malicious macros embedded in Word documents are...

Note: technically the -ls option to find is not part of Posix, although it will be an option in most finds...

A good alternative is to use:
find . -type d -exec ls {} +

Which really is much...

As RudiC already has told you: pipe it into mail! There is no need for an intermediary file:

find <...your complete command...> | mail -s "Subject Text" recipient@host

This will generate the...

Copy to where? To mail it, pipe it into the mail command.