Using sed with ${parameter}

Question

Problem

How do we use variables in a sed edit string?

Example

The file statement.txt is the sentence

I like my pet bird.

Given a variable ${myPet}, how can we use sed to replace bird with the value in ${myPet}?

What doesn't work

sed -ie 's/bird/${myPet}/g' statement.txt

The result is

I like my pet ${myPet}.

Answer 1

' single quotes don't expand value of a shell variable so you need to use " double quotes here.

myPet="your_value"
sed -ie "s/bird/${myPet}/g" statement.txt