How to Change File Permissions in CentOS 7

Change File Permissions in CentOS 7

Welcome, CentOS User! The Tutorial shows you Step-by-step How to Set or Change the File/Directory Permissions on CentOS 7 GNU/Linux.

And Following the CentOS 7 Change File Permissions Tutorial you’ll acquire also a little Practice on the CentOS Linux Console Terminal Command Line.

Finally, included int the Article Links to Guides on CentOS Command Line Quick Start and to Setting Ownership over CentOS File System.

1. Open a Shell Terminal emulator window
   (Press “Enter” to Execute Commands)

   

   In case first see: Terminal QuickStart Guide.

Command Line Tutorial for Beginners CentOS 7

CentOS Console Quick Start Guide
Getting-Started with Terminal on CentOS

2. 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!

3. 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!)

4. How to Set Ownership on CentOS File System

   CentOS Setting Ownership Quick Start

   Setting Up Ownership on CentOS