Variables in sed command?

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I was wondering if anyone could help me out with the syntax of a sed command. I am writing a script to delete virtual hosts from the Apache config file. I know that the following command works.

sed -e '1108,1116d' /etc/httpd/conf/httpd.conf > /etc/httpd/conf/httpd.tmp

What I would like to do is replace 1108 and 1116 with the variables $startline and $endline, but I keep getting errors. I have tried

sed -e '$startline,$endlined' /etc/httpd/conf/httpd.conf > /etc/httpd/conf/httpd.tmp
sed -e '`echo $startline`,`echo $endlined`' /etc/httpd/conf/httpd.conf > /etc/httpd/conf/httpd.tmp


However neither one worked. Does any one have any idea? I would really appreciate it. Right now I'm clueless.

Jim

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