Permissions in Unix are an integral part of the operating system.
You can see the details of all files in the current directory by using options -l and -a combinedly with ls command:
ls -al
Every file has an owner (also referred to as the user), a group and permissions. A user can be part of many groups. A group can have many users.
The permission attributes of a file signify who can do what.
In file type, - represents file and d represents directory.
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