All that you guys want is already in there, just no prominently documented
or used,
serial lines: enable SAK (man setserial)
text console: alt-sys-K (less /usr/src/linux/Documentation/sysrq.txt)
X console: ctl-alt-backspace (man XFree86)
Network connections (eg. telnet, ssd, rlogin, ftp) are safe against
spoofing if the host isn't compromised.
Cheers,
Rafael
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