Tools
chmod Cheat Sheet
Print-ready cheat sheet for chmod, organized for fast lookup, study, and desk-side use
Sample
What's in this cheat sheet
- Numeric Mode
- Symbolic Mode
- Common Permissions
- Directory Permissions
- Special Bits
- Recursive
- umask
- Common Patterns
Octal Permission Digits
4 | Read (r) |
2 | Write (w) |
1 | Execute (x) |
0 | No permission |
Three-Digit Format
chmod 755 file # rwxr-xr-x
chmod 644 file # rw-r--r--
chmod 700 file # rwx------
chmod 600 file # rw-------
Digit Calculation
7 (4+2+1) | rwx — read, write, execute |
6 (4+2) | rw- — read, write |
5 (4+1) | r-x — read, execute |
4 | r-- — read only |
3 (2+1) | -wx — write, execute |
2 | -w- — write only |
1 | --x — execute only |
0 | --- — no permissions |
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