Create sudo user non-interactively

Skip the prompts that come with creating a user typically, and give them sudoers privileges. Replace  ${USERNAME}  with the user you want to create. 
 # The man page explanation for --gecos isn't that intuitive IMO
# Basically specifying --gecos "" states you don't want to ask
# for real name, phone, etc.
USERNAME=everythingisnormalhere
adduser --disabled-password --gecos "" "${USERNAME}"
touch "/etc/sudoers.d/10_${USERNAME}"
echo "${USERNAME} ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/10_${USERNAME}" 
 Resources:   https://askubuntu.com/questions/94060/run-adduser-non-interactively   https://askubuntu.com/questions/420784/what-do-the-disabled-login-and-gecos-options-of-adduser-command-stand