Question

I have some strings like below:

ffffffffcfdeee^dddcdeffffffffdddcecffffc^cbcb^cb`cdaba`eeeeeefeba[NNZZcccYccaccBBBBBBBBBBBBBBBBBBBBBB

eedeedffcc^bb^bccccbadddba^cc^e`eeedddda`deca_^^\```a```^b^`I^aa^bb^`_b\a^b```Y_\`b^`aba`cM[SS\ZY^BBB

Each string may (or may not) end with a stretch of trailing B of varied length.
I’m just wondering if we can simply use Bash code to remove the B stretch?

Answer 1

You could try something like

sed 's/\(.\)B*$/\1/' file

Input

aaa BBBBB
aaa BBBBB cccc
aaa bbb ccc BBBBBBB

Output

aaa
aaa BBBBB cccc
aaa bbb ccc