Change default editor in Debian
` update-alternatives –config editor` There are 7 alternatives which provide `editor’. Selection Alternative ———————————————– 1 /bin/ed 2 /bin/nano 3 /usr/bin/vim.tiny 4 /usr/bin/vim.basic 5 /usr/bin/nedit 6 /usr/bin/emacs21 7 /usr/bin/xemacs21 Press enter to keep the default[*], or type selection number: 6