How to Ubuntu Change File Permissions on Command Line

March 25th, 2017 by thelinuxevangelist

Ubuntu Change File Permissions




Hello Ubuntu User! This Tutorial Shows You Step-by-step How-to Set or Change File/Directory Permissions on Ubuntu GNU/Linux.

And Following along this Change File Permissions Ubuntu Tutorial You will get a Little Practice to Work on the Ubuntu Linux Command Line.

Finally included in the Article Links to Guides on Ubuntu Terminal Tutorial for Beginners and to Setting Ownership over Ubuntu File System.

Set/Change Files and Directories Permissions on Ubuntu Linux Command Line - Featured
  1. Open Terminal Console Window
    Ctrl+Alt+t
    (Press “Enter” to Execute Commands)

    Ubuntu How-to Set/Change File and Directory Permissions - Featured
  2. See Further on Ubuntu Terminal Tutorial for Beginners:

    Ubuntu Terminal Quick Start Guide
  3. Who Can Change File’s Permissions?

    • You Can Freely Change Permissions over Files/Directories Your User’s Hold.
    • But you need Admin Super User Powers to Change Permissions on Entities he Do Not Hold!
  4. Setting Up Permissions on Files and Directories

      Basic Building Blocks for the Permission Command

      Ownership Types:

      • Use ‘u‘ to Setup Permissions for the User Owner
      • Use ‘g‘ to Setup Permissions for the Group Owner
      • Use ‘u+g‘ to Setup Permissions for the User and Group Owner
      • Use ‘a‘ to Setup Permissions for All (World)
      • Use ‘o‘ for Revoking Actual Permissions and Giving Permissions to the Others (the Before Disabled ones)

      Permission Types:

      • Use ‘x‘ to Setup Execution Permission
      • Use ‘w‘ to Setup Write/Delete Permission
      • Use ‘r‘ to Setup Read Permission

      Giving/Removing Permissions:

      • Use ‘+‘ to Give Permission
      • Use ‘‘ to Remove Permission

    Generic Permission Command Form:

    chmod ownershipSubject[+/-]r/w/x [myEntity]

    For Instance :

    mkdir $HOME/world

    To Give ‘All’ (read,write/delete,execute) Permissions on the ‘world’ Directory to ‘Everybody’:

    chmod a+rwx $HOME/world

    (Normally Take Care Before to Open a Directory to the World Because this Can Compromise Your System Security!)
    Now to Check Permissions Setup:

    ls -l $HOME

    To Remove the ‘Write/Delete’ Permission to the ‘World’:

    chmod a-w $HOME/world

    To Give the ‘Write/Delete’ Permission the ‘world’ Only to the Owner:

    chmod u+w $HOME/world

    To Give the ‘Write/Delete’ Permission the ‘world’ Also to the Owner’s Group:

    chmod g+w $HOME/world

    To Remove the ‘Execution’ Permission to the ‘World’:

    chmod a-x $HOME/world

    To Give the ‘Execution’ Permission to the ‘world’ to the Owner:

    chmod u+x $HOME/world

    To Give the ‘Execution’ Permission to the ‘world’ Also to the Owner’s Group:

    chmod g+x $HOME/world

    (After Only You and Your Group will be Able to Access the ‘world’ Directory Directory on Shell!)

  5. How-to Set Ownership on Ubuntu File System:

    Ubuntu Setting Ownership Quick-Start

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