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Unix Permission Calculator
Toggle bits. Output updates live.
Special Bits
S
setuid (4000)
G
setgid (2000)
T
sticky (1000)
Owner
Group
Other
r
read
w
write
x
exec
r
read
w
write
x
exec
r
read
w
write
x
exec
Symbolic
----------
Octal
0000
Description
No permissions set.
Common values
644 — files (owner rw, group/other r)
755 — dirs / executables
700 — owner only
600 — private files (SSH keys, etc.)
4755 — setuid executable
1777 — sticky (e.g. /tmp)
777 — world-writable (dangerous in web roots)