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Hmmm. I take it you're grepping for a list of words there? You can probably do that in one grep instead of 10,000:

grep -f good_ones.txt newdb.txt |
while read LINE
do
echo...

It is very important. Thank you for posting it.

What's even more important, of course, is the contents of the script itself, and where the error occurs in it...

'resource temporarily...

To illustrate: open a command prompt in Windows:
> echo text1 > A.txt
> type a.txt
text1
> echo text2 >> a.txt
> type a.txt
text1
text2

You've got the right idea, but == means equal, not regex. ~ is a regex comparison.

Putting an expression in front of an outer code-block like that is an implied "if", by the way. "if this regex...

You are out of luck, period.

Windows filesystem is case-insensitive. Cygwin is not a magical backdoor that can overcome this fundamental operating system limitation. It operates inside Windows...