chmod Calculator — Octal & Symbolic Permissions
Type a permission as octal (755) or symbolic (rwxr-xr-x),
or tick the boxes. The octal, symbolic, chmod command and a plain-English
explanation update live — entirely in your browser.
| Read | Write | Execute | |
|---|---|---|---|
| Owner | |||
| Group | |||
| Others |
Result
| Octal | — |
| Symbolic | — |
| Command | — |
In plain English
—
How Unix file permissions work
Every file has three permission classes — owner, group,
and others — and each class can be granted read (4),
write (2), and execute (1). Add the numbers within a class
to get its octal digit: rwx = 4+2+1 = 7, r-x = 4+1 =
5, r-- = 4. Three digits make a full mode like
755.
Looking for a specific one? Browse common permissions on the home page.