sed with variable

Linux and Unix-Like Red Hat
1

Hi Friends
in sed whether we can use variable.like the following expression.
sed -i 's/ABC/$var/g' filename

I am using Kernel 2.6.18-194.11.1.el5 RedHat linux.

I have tried sed -i 's/ABC/"$var"/g' filename, still not working.:frowning:

Please help.

Thanks in advance
Joy