I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run command says about this flag, which is the following,
-t, --tty=true|false Allocate a pseudo-TTY. The default is false. When set to true Docker can allocate a pseudo-tty and attach to the standard input of any container. This can be used, for example, to run a throwaway interactive shell. The default is false. The -t option is incompatible with a redirection of the docker client standard input. Things like pseudo-TTY or “attaching to the standard input”. So if this interactive shell isn’t the standard input for docker container, what is actually the standard input, to which it attaches?