If you want a full featured local linux command line, you can switch to developer mode and install one in a chroot via something like https://github.com/dnschneid/crouton
This does sidestep some of the security features of the device, but it's fine if you really want it. Or you can just ssh somewhere.
This does sidestep some of the security features of the device, but it's fine if you really want it. Or you can just ssh somewhere.