Permissions in linux

Permission Groups

There are three user based permission groups for each file and directory:-

1.  Owner(u) – The owner permissions apply only the owner of the file and directory.
2.  Group(g) – The group permissions apply only to the group that has been assigned to the file and directory.
3.  All users(o) – The all user permissions apply to all the users on the system.

 

Permission Types

Each file or directory has three basic permission types:-

1. Read(r) – The read permission allows to read the content of the file.
2. Write(w) – The write permission allows the users to write or modify the content of the file and directory.
3. Execute(x) – The execute permission allows the users to execute a file or view the content of a directory.

 

Octal Digit	Text Equivalent	Binary Value	Meaning
0	—	000	All types of access are denied
1	–x	001	Execute only
2	-w-	010	Write only
3	-wx	011	Read only
4	r–	100	Read access is allowed only
5	r-x	101	Read and execute access are allowed
6	rw-	110	Read and write access are allowed
7	rwx	111	Everything is allowed