How to replace a whole line with sed?

Question

Suppose I have a file with lines

aaa=bbb

Now I would like to replace them with:

aaa=xxx

I can do that as follows:

sed \"s         


        

Answer 1

This might work for you:

cat < aaa=bbb
> aaa=ccc
> aaa=ffffd
> aaa=[something else]
!
aaa=bbb
aaa=ccc
aaa=ffffd
aaa=xxx