visudo edits the sudoers file in a safe fashion

visudo is a command-line utility that allows editing of the /etc/sudoers file in a safe fashion. It opens /etc/sudoers, using the vi editor's interface by default (although this can be changed by setting the shell's EDITOR environment variable to a different text editor), prevents multiple simultaneous edits with locks, performs sanity checks and checks for parse errors.

Source: [Wikipedia] - visudo (command)

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