Sed replace variable in double quotes

Question

I\'ve created a bash script that takes a parameter. I want to pass that parameter to sed to replace an existing string with another which is composed of the variable:

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Answer 1

Change your code like his,

sed -i -e 's/name="master"/name="'"$variable"'"/g' test

Answer 2

just do like this:

var=apple
sed -i "s/pineapple/$"

Answer 3

Variable expansion does not happen within single quotes. Do it in double quotes:

sed -i -e 's/name="master"/name="'"$variable"'"/g' test