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Working with Special Bits

While they don't come up very often, it's important to know how to manage the special bits that can be set on files and directories. This lab will walk through some of the ways to manage them.

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Lab Info
Level
Beginner
Last updated
Apr 06, 2025
Duration
15m

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Table of Contents
  1. Challenge

    Create the Collaborative Area

    First, we need to create the directory:

    mkdir /opt/managers

    Then we set it so that all new files created will be owned by the managers group:

    chmod g+s /opt/managers

  2. Challenge

    Create a Scratch Area, Similar to /tmp, Named scratch

    First create the directory:

    mkdir /opt/managers/scratch

    Then set permissions:

    chmod 777 /opt/managers/scratch

    Then set the Sticky Bit:

    chmod o+t /opt/managers/scratch

  3. Challenge

    Configure the suid Executable

    First we need to copy the executable:

    cp /tmp/suid /opt/managers

    Then set ownership:

    chown bob.managers /opt/managers/suid

    And finally we set the setUID bit:

    chmod u+s /opt/managers/suid

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