Understanding file ownership and permissions
UNIX provides three levels of file ownership:
User: Refers to the single userid that's primarily in charge of the file. You have this level of ownership for the files you create.
Group: Refers to the group (of users) associated with a specific file. All users within a group have the same permissions for interacting with a file.
Other: Refers to any users not identified with either the group or user for a file.
Within these groups, you can specify permissions for file access and rights in three categories:
Read: Users with read permission can only view a file; they cannot make changes to it.
Write: Users with write permission can make changes to or delete a file.
Execute: Users with execute permission ...
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