From http://colemak.com/Unix

Linux in text console mode
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    Download, untar/gunzip archive
    Under Debian/Ubuntu/Knoppix/Debian derivatives type: install-keymap linux_console/colemak.iso15.kmap to install as the default layout.
    Type: loadkeys linux_console/colemak.iso15.kmap to switch layouts.
    To switch to a ISO8859-15 compatible font type: consolechars -f lat9v-14
    To switch back to QWERTY type: loadkeys us
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