Linux: Exiting an SSH connection

ESCAPE CHARACTERS
When a pseudo-terminal has been requested, ssh supports a number of
functions through the use of an escape character.

 A single tilde character can be sent as ~~ or by following the tilde by
 a character other than those described below.  The escape character
 must always follow a newline to be interpreted as special.  The escape
 character can be changed in configuration files using the EscapeChar
 configuration directive or on the command line by the -e option.

 The supported escapes (assuming the default ‘~’) are:

 ~.      Disconnect.

 ~^Z     Background ssh.

 ~#      List forwarded connections.

 ~&      Background ssh at logout when waiting for forwarded connection
         / X11 sessions to terminate.

 ~?      Display a list of escape characters.

 ~B      Send a BREAK to the remote system (only useful if the peer sup‐
         ports it).

 ~C      Open command line.  Currently this allows the addition of port
         forwardings using the -L, -R and -D options (see above).  It
         also allows the cancellation of existing port-forwardings with
         -KL[bind_address:]port for local, -KR[bind_address:]port for
         remote and -KD[bind_address:]port for dynamic port-forwardings.
         !command allows the user to execute a local command if the
         PermitLocalCommand option is enabled in ssh_config(5).  Basic
         help is available, using the -h option.

 ~R      Request rekeying of the connection (only useful if the peer
         supports it).

 ~V      Decrease the verbosity (LogLevel) when errors are being written
         to stderr.

 ~v      Increase the verbosity (LogLevel) when errors are being written
         to stderr.