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SSH can be controlled trough an ~ escape sequence. Example, to terminate the current ssh connection, type a newline, then the ~ character, and last a . character.
This is useful eg when an ssh connection hangs after you reboot a machine and the connection hangs.
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A key sequence for terminating a frozen session. Full sequence on a swedish keyboard: [ENTER] [ALTGR] tilde [SPACE] dot
If you can do better, submit your command here.
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