| # | Permission | rwx | Binary |
|---|---|---|---|
| 7 | read, write and execute | rwx | 111 |
| 6 | read and write | rw- | 110 |
| 5 | read and execute | r-x | 101 |
| 4 | read only | r– | 100 |
| 3 | write and execute | -wx | 011 |
| 2 | write only | -w- | 010 |
| 1 | execute only | –x | 001 |
| 0 | none | — | 000 |
For example, 754 would allow:
- “read”, “write”, and “execute” for the user class, as the binary value of 7 is 111.
- “read” and “execute” for the Group class, as the binary value of 5 is 101.
- Only “read” for the Others class, as the binary value of 4 is 100.
