Linux operating system uses license regime specify user rights to each file. This set of permissions:
-Who can read the file. If the file is a directory, read the contents of the directory means the list.
-Who can write / edit files. If the file is a directory, this permission determines whether you can make changes to the contents of the directory, for example, create or delete files.
-What can execute the file. If the file is a directory, this permission determines whether you can enter the directory and access its contents, for example, search the directory or run a program in it.
Permissions are assigned to the file owner, the owner of the file, and for all users. For example, you can configure your document readable and writable by the owner only, and can only be read by others. Continue reading