>        sed 's/$OLD/$NEW/' $file <-----------------I know this will only
> search and replace but how do I do in in-place so that the file itself is
> modified.*

sed -a 's/old/new/wfilename' filename

It is explained in:
cd /usr/share/doc/usd/15.sed/; make paper.txt; less paper.txt

Why dont you use the date as the serial?

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