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visudo — edit sudoers safely

cheat sheet · Ubuntu 24.04 · sudo 1.9.15 https://lab.dimsanych.ru/en/wiki/visudo/

Cheat sheet

sudo visudo the main /etc/sudoers
sudo visudo -f /etc/sudoers.d/deploy a separate rule file
sudo EDITOR=vim visudo -f /etc/sudoers.d/deploy another editor
sudo chmod 0440 /etc/sudoers.d/deploy the mode sudo expects
sudo visudo -c check all files and their modes
sudo visudo -cf /tmp/candidate check a finished file
sudo -l -U deploy what deploy may run in the end

Options

Full list — man visudo; the rule grammar — man sudoers.