I've managed to mess up some shared libraries on my system, and now my shell cannot be run, thus locking me out of the system. Both
scp, as configured on the remote system, seem to rely on the shell, so those alternatives are out. Really, it is not a big issue because I have some remote hands that can change my shell to
sh via console.
However I'm curious, getting down to the mechanics of the SSH protocol, whether it is possible to authenticate and perform some manipulations on the remote system (eg, modifying
/etc/passwd), without ever invoking the shell?
Just to be fair, to the fellow who suggested specifying the alternative command/shell after the ssh command string (eg,
ssh myhost /bin/sh): the man page does state:
If command is specified, it is executed on the remote host instead of a login shell.
which could definitely be confusing.