Can I use a variable in sed?

[Jerome Fong]

I'm trying to write a script that allows me to change the port number 
depending on when environment I'm in.  I can pass in the port number to 
my script, but I stuck trying to get sed modify my file with my port 
number variable.   Here is the line I'm executing

sed '1,$ s^8080^$Shutdown_Port^' <./temp.xml >./server.xml

Since my line started out to be
<Server port="8005" shutdown="SHUTDOWN">

Since Shutdown_Port was 9300, I thought the resulting line would be

<Server port="9300" shutdown="SHUTDOWN">

Instead, I got:

<Server port="$Shutdown_Port" shutdown="SHUTDOWN">

What am I doing wrong here?  Can sed be passed a variable?

thanks,

Jerome


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