Linux File Permissions
Under Linux, the files are set up in such a way that the level of access to each of them is controlled. There are ‘read', ‘write' and ‘execute' file permissions in Linux. Each file belongs to a specific user, group, or to what is referred to as ‘other'. The term ‘other' is used to refer to someone who is not the owner of the file and does not belong to the group the owner is a member of. File permissions can be seen with the ‘ls -l' command and can be altered with the ‘chmod' and ‘chown' commands.