sed problem

Hi, Please could someone advise, how I can resolve the sed problem that I have. I'm creating the following variable : SAN_HOME_PROPERTY=`cat $BKUPDIR/environment.properties | grep SAN_HOME=` this gives me the following value : SAN_HOME=/san/dev6/bin/REL1_BC0876_CD2011 then, when i perform the SED command as per below : sed "s/SAN_HOME=/\$\SAN_HOME_PROPERTY/g" $SAN_TOP/cfg/environment.properties When I check the file - $SAN_TOP/cfg/environment.properties the sed command enters the variable $SAN_HOME_PROPERTY, instead of entering the variable value SAN_HOME=/san/dev6/bin/REL1_BC0876_CD2011 How can I sed the value into the file from the variable ? thank you

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