Remove bracket from a particular string

Question

If some text is like

cell (ABC)
(A1)
(A2)
function (A1.A2)

I want output as

cell ABC
A1
A2
function (A1.A2)

I want to remove bracket from each line of file except the present in function line. Using code

sed 's/[()]//g' file 

Removes bracket from each line. How can I modify the above code to get desired output.

Answer 1

You can add a jump out condition to your sed command:

sed '/^function /b;s/[()]//g' file

Or, condition the substitute on not matching a function:

sed '/^function /!s/[()]//g' file