Use a variable in a sed command

Question

I can\'t seem to use a variable in a sed command, for example:

sed \"24s/.*/\"$ct_tname\"/\" file1.sas > file2.sas

I want $ct_tnam

Answer 1

Shell variables are not expanded inside single quotes. Try this instead:

sed "24s/.*/\"$ct_tname\"/" file1.sas > file2.sas