How to take the characters in parentheses in Shell

1. Use grep (the result is enclosed in parentheses. I wonder if I can match the content in the brackets only)

$ A = 'abc [EDG] adfirpqu '$ echo $ A | grep-O '\[. * \] '# escape [EDG] $ B = 'abc (EDG) adfirpqu' $ echo $ B | grep-O '(. *) '(EDG)

2. Use cut

$ A = 'abc [EDG] adfirpqu '$ echo $ A | cut-d' ['-F2 | cut-d'] '-f1edg $ B = 'abc (EDG) adfirpqu '$ echo $ A | cut-d' ('-F2 | cut-d') '-f1edg

3. Use string Truncation

$ A = 'abc [EDG] adfjaierqpwe '$ B =$ {A # * [} $ echo $ bedg] adfjaierqpwe $ C =$ {B %] *} $ echo $ cedg

How to take the characters in parentheses in Shell