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Thank you radoulov

The second method is a little more intutitive . . . Is there a way to execute the expression without the -n option?

Thanks again

Thank you for the reply..
However I have to do the following using egrep.

I tried translating what you gave using -r:
sed -r 's/^([A-Z][A-Z])[A-Z].*/\1/g' temp.txt

Updated temp.txt:...

Hello,

I have a file temp.txt:
-------------------------
HELLO WORLD
This is a temp file.
TENCHARSHEre
no beginning UPPERCHARS
HI There
-------------------------

What is a sed egrep...