sudo com lecture file

sudo visudo

#add ao arquivo
Defaults       lecture=always
Defaults       lecture_file=/etc/sudo_lecture.txt

Clique no link para fazer o download do arquivo e evitar a perda de caracteres.

groot.txt

     [00;32m  \^V//
     [00;33m  |[01;37m. [01;37m.[00;33m|   [01;34m I AM (G)ROOT!
     [00;32m- [00;33m\ - / [00;32m_
     [00;33m \_| |_/
     [00;33m   \ \
     [00;31m __[00;33m/[00;31m_[00;33m/[00;31m__
     [00;31m|_______|  [00;37m With great power comes great responsibility.
     [00;31m \     /   [00;37m Use sudo wisely.
     [00;31m  \___/
[0m

Criar o arquivo: /etc/sudo_lecture.txt

sudo cp groot.txt /etc/sudo_lecture.txt

Testando:

sudo -k
sudo -i

Fonte:

https://www.cyberciti.biz/open-source/command-line-hacks/adding-spice-to-your-sudo-session-with-a-lecture-file-on-linux-or-unix/