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Working with Linux File Access Control Lists (FACLs)

In this lab, we'll review what file access lists (FACLs) are used for. We'll set up a FACL to restrict access to a single file. We'll implement one rule to permit access for a single user, and then we'll edit permissions to remove access for all other users.

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Lab Info
Level
Beginner
Last updated
Aug 01, 2025
Duration
30m

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Table of Contents
  1. Challenge

    Create user account `pjohnson` and the project directory and file.
    1. Create the user account pjohnson with the following command:
      sudo useradd pjohnson  
      
    2. Create the project directory with the following command:
      sudo mkdir /project51  
      
    3. Create the TPSreport.txt file in the /project51 directory with the following command:
      sudo touch /project51/TPSreport.txt 
      
  2. Challenge

    Create FACL to permit user `pjohnson` access to file `TPSreprot.txt`.
    1. Create a FACL for /project51/TPSreport.txt permitting user pjohnson RWX access:

      sudo setfacl -m u:pjohnson:rwx /project51/TPSreport.txt
      
  3. Challenge

    Remove access for other users from the file `/project51/TPSreport.txt`.
    1. To remove other users' access, use the following command:

      sudo chmod o-rwx /project51/TPSreport.txt
      
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