File Permission and Access Control Lists:

The concept of Linux File permission and ownership is important in Linux. Here, we will be working on Linux permissions and ownership and will do tasks on both of them. Let us start with the Permissions.

Create a simple file and do ls -ltr to see the details of the files Each of the three permissions are assigned to three defined categories of users. The categories are:

- :: File

d :: Directory

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  • owner — The owner of the file or application.

  • "chown" is used to change the ownership permission of a file or directory.

  • group — The group that owns the file or application.

  • "chgrp" is used to change the group permission of a file or directory.

  • others — All users with access to the system. (outised the users are in a group)

"chomod" is used to change the ownership permission of a file or directory.

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• when you run chmod 777 <file or directory>, you are granting full read, write, and execute permissions to the owner, the group, and others for that file or directory.

• The chmod 000 command is used to remove all permissions from a file or directory for the owner, group, and others.