nano

== file ==
Ctrl + o  write out
Ctrl + x  exit

== edit ==
Ctrl + k  cut line
Ctrl + u  paste line

== move ==
Ctrl + w Ctrl + y  first line
Ctrl + w Ctrl + v  last line
Ctrl + a  head of line
Ctrl + e  end of line

== search ==
Ctrl + w

== window ==