chmod Calculator help

chmod Calculator converts a permission set between the three ways it is written: an octal number, the symbolic rwx string, and words.

Steps

  1. Enter permissions as octal or as a symbolic string.
  2. Read every other form, including the plain-English breakdown.
  3. Toggle the read, write, execute, and special bits to see the numbers change.

Common questions

What does 755 mean?

The owner can read, write, and execute; the group and everyone else can read and execute. It is the common setting for directories and scripts.

What is the leading fourth digit?

It holds the special bits: 4 is setuid, 2 is setgid, 1 is sticky. So 4755 is setuid plus 755.

Capital S or T in the symbolic string?

It means the special bit is set but the matching execute bit is not, which is usually a mistake worth checking.

Does anything leave my browser?

No. The tool runs entirely on this page.

Everything runs in your browser. Nothing you enter or drop is uploaded.

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