Change File Permissions in CentOS
Welcome CentOS User! This Tutorial Shows You Step-by-step How-to Set or Change the File/Directory Permissions on CentOS GNU/Linux.
And Following the CentOS 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.
CentOS Terminal Tutorial for Beginners:CentOS Terminal Quick Start
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!
Setting Up Permissions on Files and Directories
- 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)
- Use ‘x‘ to Setup Execution Permission
- Use ‘w‘ to Setup Write/Delete Permission
- Use ‘r‘ to Setup Read Permission
- Use ‘+‘ to Give Permission
- Use ‘–‘ to Remove Permission
Basic Building Blocks for the Permission Command
Generic Permission Command Form:
chmod ownershipSubject[+/-]r/w/x [myEntity]
For Instance :
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!)
How-to Change File Owner on Linux CentOS File System:CentOS Setting Ownership Command Line