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Unix Permissions Calculator

Interactive chmod calculator with visual grid, presets, and command generator

Permission Matrix
Read (4)Write (2)Execute (1)Octal
Owner 7
Group 5
Others 5
Special Permissions
Setuid (4)
Setgid (2)
Sticky Bit (1)
Permissions Value
0755
Command
$ chmod 755 filename
ls -la Preview
-rwxr-xr-x
Common Presets
Permission Reference

Read (r = 4)

Files: view contents. Directories: list files inside.

Write (w = 2)

Files: modify contents. Directories: add or remove files.

Execute (x = 1)

Files: run as program. Directories: cd into and access files.

Setuid (4xxx)

Execute file as the owner (e.g., passwd). Shows as "s" in owner execute.

Setgid (2xxx)

Execute as group / new files inherit group. Shows as "s" in group execute.

Sticky Bit (1xxx)

Only owner can delete files in directory (e.g., /tmp). Shows as "t" in others execute.

Common Files

644 for regular files, 755 for executables and scripts, 600 for private configs.

Common Directories

755 for shared dirs, 700 for private dirs, 1777 for /tmp (sticky).

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