A file can have three types of permissions:
- Read : Authorized user can read the contents of the file.
- Write : Along with read permission, it allows the allowed user to modify its contents.
- Execute : If the file is an executable, any allowed user can execute it
A file can be accessed by:
Ø User : Person creating the file. He grants all the authorizations to the file
Ø Group : Group user for the file
Ø Others: All other users not belonging to the group or are not the creator.
Value
|
Significance
|
4
|
Read permission
|
2
|
Write permission
|
1
|
Execute permission
|
6(=4+2)
|
Read and write permission
|
7(=4+2+1)
|
Read,write and execute permission
|