[Techtalk] bash scripting with sed

[J Neefer!]

Hi,

I'm trying to write a bash script to do several things on some
dns zone files:

(1) rename the files
(2) modify the TTL, etc numbers from seconds to the 1H, etc format
(3) change the name server and contact in the SOA
(4) add some commented-out entries to the body of the file

I've got everything except #4 working.  What I want to do is
insert a bash $VAR into the sed command, but sed is barfing up an
error on it.

The script looks like this (the ^T characters are literal tabs in
the script file):

for FILE in `ls pri.*`
do
   NAME=`echo $FILE | cut -d. -f2,3`
   NAME="$NAME.hosts"

   sed -e '
      s/SOA ns.mydomain.net/SOA ns1.mydomain.com/;
      s/admin.ns.mydomain.net/hostmaster.mydomain.com/;
      s/10800/8H/;
      s/3600/1H/;
      s/604800/1W/;
      s/^Tin^T/^TIN^T/;
      s/^Ta^T/^TA^T/;
      s/^Tcname^T/^TCNAME^T/;
      s/^;$//;
	/^www.*/a
;www.$NAME\.      IN      A       2.2.2.2
      ' $FILE > $NAME
done

That append is inserting the literal '$NAME' when I want the
contents of the bash variable to be inserted instead.

So how do I get the *value* of $NAME into my sed command?

Thanks.

--Neefer