What about for the statement that appends data to the end of the file?

sed "$a\\
PR_DbConfigEnd $FILENAME " <$FILENAME >$TMPFILENAME

I get the error message:

sed: command garbled: \


If I remove the second backslash:

sed "$a\
PR_DbConfigEnd $FILENAME " <$FILENAME >$TMPFILENAME


I get this error message:

sed: command garbled: PR_DbConfigEnd test2.txt