The following are the commands for changing file permissions:
To check the file permission, enter the following command:
$ ll file_name
The file permission details are as seen in the following diagram:
In the preceding diagram, as we can see, permissions are grouped in owner-user, group, and other users' permissions. Permissions are of three types–read, write, and execute. As per the requirement, we may need to change the permissions of the various files.