[WBEL-users] Need some help with sed

[Benjamin J. Weiss]

Howdy, y'all! :)

I'm trying to write a script that can be run on new WBEL installations 
that will turn the box into an email server with anti-virus, spam, TLS, 
etc.  Anyway, I'm using sed to change the configuration files, and I'm 
running into a problem.  (Note that this is the first time I've used sed 
for anything).  

I'm trying to use sed to append Dag Wieer's repo to the /etc/yum.conf 
file.  Everything works great except the final expression.  The two before 
it work fine, where I'm using single quotes for the append command.  
However, I want to use a shell variable in the final expressin, so I'm 
using double quotes.  I've read the sed chapter in "Linux in a Nutshell" 
and googled and read other sites, but I can't seem to figure this one out.  
The relevant parts of the script are as follows:


--------------

YUM_BASE=http://cassandra/whitebox_mirror/\$releasever/en/os/\$basearch/
YUM_UPDATES=http://cassandra/whitebox_mirror/\$releasever/en/updates/
YUM_DAG=http://cassandra/whitebox_mirror/dag/

# Set up Yum to hit a local repository.  I'm including Dag Wieer's 
# repo becuase he  maintains packages that otherwise we'd have to compile 
# and maintain ourselves.
mv /etc/yum.conf /etc/yum.conf.000
sed     -e '/http:/s/\(.*\)/#\1/' \
        -e '/ftp:/s/\(.*\)/#\1/'  \
        -e "/Base/abaseurl=$YUM_BASE" \
        -e "/Updates/abaseurl=$YUM_UPDATES" \
        -e '$a\[dag]' \
        -e '$a\name=Dag Wieers Repo' \
        -e "$a\baseurl=$YUM_DAG" \
    /etc/yum.conf.000 > /etc/yum.conf

--------------

Any ideas what I'm doing wrong?

Thanks!

Ben