Terminate a hanging SSH session
It may be very frustrating when SSH sessions just hangs because the target is power cycling or something. Lucky for you there is a "secret" escape sequence that allows you to terminate the session (and a few other things).
The escape sequence is <enter>~X where X is a command letter. To see all available key sequences, type <enter>~?.
Example output:
1 marcus@Ilos:~$ ~?
2 Supported escape sequences:
3 ~. - terminate connection (and any multiplexed sessions)
4 ~B - send a BREAK to the remote system
5 ~C - open a command line
6 ~R - Request rekey (SSH protocol 2 only)
7 ~^Z - suspend ssh
8 ~# - list forwarded connections
9 ~& - background ssh (when waiting for connections to terminate)
10 ~? - this message
11 ~~ - send the escape character by typing it twice
12 (Note that escapes are only recognized immediately after newline.)<enter>~. is my favorit. It terminates the connection and keep your mood cheerful.