I tried to install netcat like this but it fails since I am not able to answer the question. Is there any way to specify the answer for the prompt without having to run in interactive mode?
$ docker exec nginx apt-get install netcat Reading package lists... Building dependency tree... Reading state information... The following additional packages will be installed: netcat-traditional The following NEW packages will be installed: netcat netcat-traditional 0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 75.9 kB of archives. After this operation, 156 kB of additional disk space will be used. Do you want to continue? [Y/n] Abort. $