Unix File Permissions

Letter Permission

r Read

w Write

x Execute, Go through (for directories)

- No permission

 

Letter Type of users

u User (owner of the file)

g Group (group to which belong the file)

o Other (users who are neither a member of the Group nor the owner of the file)

a All (everybody)

Permission Value

-                   0

x                  1

w                 2

r                  4

Permission Value

---              0

--x             1

-w-            2

-wx           3

r--             4

r-x            5 

rw-           6

rwx           7