chmod Permission Index
Complete technical directory of all 512 POSIX file permission modes and advanced 4-digit special permission bits.
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Most Common Permissions
The 22 primary file permission configurations used in standard production Linux environments:
777
Critical Risk
rwxrwxrwx
Full Access for Everyone
755
Low Risk
rwxr-xr-x
Standard for Directories & Scripts
750
Low Risk
rwxr-x---
Owner Full, Group Read/Execute
744
Low Risk
rwxr--r--
Owner-Executable, Read-Only for Others
740
Low Risk
rwxr-----
Owner Full, Group Read
711
Low Risk
rwx--x--x
Traverse Without Listing
700
Restrictive
rwx------
Private to the Owner
666
Critical Risk
rw-rw-rw-
Read/Write for Everyone
664
Moderate
rw-rw-r--
Group-Writable File
660
Moderate
rw-rw----
Group-Private Read/Write
644
Low Risk
rw-r--r--
Standard for Files
640
Low Risk
rw-r-----
Owner Edit, Group Read
600
Restrictive
rw-------
Owner Read/Write Only
555
Low Risk
r-xr-xr-x
Read/Execute for All, No Write
500
Restrictive
r-x------
Owner Read/Execute Only
444
Low Risk
r--r--r--
Read-Only for Everyone
440
Low Risk
r--r-----
Read-Only for Owner and Group
400
Restrictive
r--------
Owner Read-Only
775
Moderate
rwxrwxr-x
Group-Writable Directory
770
Moderate
rwxrwx---
Group-Private Directory
754
Low Risk
rwxr-xr--
Owner Full, Group Execute, Others Read
000
Restrictive
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No Permissions
Special Permissions (setuid, setgid, sticky bit)
Advanced 4-digit permissions that control process execution privilege and directory inheritance:
4755
High Risk
rwsr-xr-x
setuid Executable
2755
Moderate
rwxr-sr-x
setgid Executable or Directory
2775
Moderate
rwxrwsr-x
Shared Group Project Directory
1777
Moderate
rwxrwxrwt
Sticky World-Writable Directory
1755
Low Risk
rwxr-xr-t
Sticky Bit Without World-Write
6755
High Risk
rwsr-sr-x
setuid + setgid Executable
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All Practical Permissions
The 64 rational permissions where access privileges adhere to standard hierarchical boundaries (owner ≥ group ≥ others):
777
rwxrwxrwx
776
rwxrwxrw-
775
rwxrwxr-x
774
rwxrwxr--
773
rwxrwx-wx
772
rwxrwx-w-
771
rwxrwx--x
770
rwxrwx---
766
rwxrw-rw-
764
rwxrw-r--
762
rwxrw--w-
760
rwxrw----
755
rwxr-xr-x
754
rwxr-xr--
751
rwxr-x--x
750
rwxr-x---
744
rwxr--r--
740
rwxr-----
733
rwx-wx-wx
732
rwx-wx-w-
731
rwx-wx--x
730
rwx-wx---
722
rwx-w--w-
720
rwx-w----
711
rwx--x--x
710
rwx--x---
700
rwx------
666
rw-rw-rw-
664
rw-rw-r--
662
rw-rw--w-
660
rw-rw----
644
rw-r--r--
640
rw-r-----
622
rw--w--w-
620
rw--w----
600
rw-------
555
r-xr-xr-x
554
r-xr-xr--
551
r-xr-x--x
550
r-xr-x---
544
r-xr--r--
540
r-xr-----
511
r-x--x--x
510
r-x--x---
500
r-x------
444
r--r--r--
440
r--r-----
400
r--------
333
-wx-wx-wx
332
-wx-wx-w-
331
-wx-wx--x
330
-wx-wx---
322
-wx-w--w-
320
-wx-w----
311
-wx--x--x
310
-wx--x---
300
-wx------
222
-w--w--w-
220
-w--w----
200
-w-------
111
--x--x--x
110
--x--x---
100
--x------
000
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Show all 512 modes (Full Octal Matrix)
All mathematical octal combinations from 000 to 777:
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