🐧 Linux & UNIX File Permissions Matrix
Linux Chmod Permissions Calculator
Calculate octal values (755, 644, 700), symbolic strings (rwxr-xr-x), and special flags (SUID, SGID, Sticky Bit) interactively.
| Scope | Read (r = 4) | Write (w = 2) | Execute (x = 1) |
|---|---|---|---|
| Owner (User) | |||
| Group | |||
| Others (Public) |
Standard Linux Modes:
755 (Web Directory / Scripts)
644 (Standard Web Files)
600 (SSH Private Keys / Secrets)
700 (Private Binaries)
777 (Full Open Access)
Octal & Symbolic Permissions
0755
Terminal Execution Command:
chmod 755 filename
Linux Permission Math & Octal Values
- Read (r = 4): Allows viewing file contents or directory listing.
- Write (w = 2): Allows modifying or deleting file contents.
- Execute (x = 1): Allows running the file as a program or traversing directories.
- Sum: $4 + 2 + 1 = 7$ (Read, Write, Execute). $4 + 2 = 6$ (Read, Write). $4 + 1 = 5$ (Read, Execute).