File Permission

In Linux, there are three types of a file.

User - the permission applies only to the owner of the file or directory, they will not impact the actions of other users. Users can also be called default owners of the file.

Group - It is a collection of users. Permission to a group same permission will be shared by all the members of the group.

Others - Any user that is not the owner of the file can be authorized as others.

Linux file permissions for all three categories of users:

Read permission: Read permission allows users to open and read files only.

Write permission: It allows the user to modify the file.

Executable permission: It allows the user to run an executable script.

In the above, d represents a directory and - represents a regular file.

The chmod command enables you to change the permissions of a file.

Read about ACL and try out the commands getfacl and setfacl

The "getacl" and "setfacl" commands are used to get and set file access control lists in Linux. ACLs allow you to specify permissions for files and directories beyond the standard user, group and other permissions.

!) getfacl

The output of the "getfacl" command will show the ACLs for the file, including the owner, group and permissions for each user and group.

!!) setfacl

"setfacl" is used to set or modify the ACLs of a file or directory.