Switching to Colemak on Linux
Set Colemak on the Linux console, in X11 and on Wayland, learn why an SSH server needs no layout, and what happens to Vim's hjkl and Ctrl keys.
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Bash history expansion: !! and !$
!! repeats the last command and !$ gives you its last argument. Learn the six bash history expansions worth knowing, plus :p to print one before it runs.