visudo

Overview

visudo safely edits the /etc/sudoers file. It locks the file against simultaneous edits and performs syntax checking before saving to prevent accidental lockout.

Syntax

visudo [options]

Common Options

Option	Description
-c, --check	Check syntax of sudoers file without editing
-f, --file FILE	Edit or check specified file instead of default /etc/sudoers
-s, --strict	Enable strict syntax checking

Key Use Cases

1. Safely modifying administrative permissions in /etc/sudoers.
2. Validating custom sudo configuration files in /etc/sudoers.d/.

Examples with Explanations

Example 1: Check Sudoers Syntax

visudo -c

Parses /etc/sudoers and validates syntax without opening an editor.

Related Commands

• sudo - Execute command as another user
• passwd - Change user password