rwxrr

rwxrr is a nonstandard, compact permission string that appears in some educational materials and puzzles to illustrate how file permission bits might be encoded or displayed. It is not part of the POSIX permission syntax used by Unix-like systems, and there is no official definition of its meaning across all sources.

In common teaching examples, the five characters are read as a shorthand for a subset of a three-by-three permission scheme. The first three characters, 'rwx', are usually taken to represent the owner's permissions: read, write, and execute. The trailing 'rr' is interpreted to indicate that the group and the others each have read permission only (no write or execute). When expanded to the standard 9-character form, this interpretation yields rwxr--r--, and the corresponding octal permission value is 744.

Because 'rwxrr' is not standardized, different materials may vary in its interpretation or use. Some sources treat it as a puzzle token rather than a direct encoding, while others may assign different meanings to the trailing 'rr' depending on the exercise. In any real system, permissions should be described using the full 9-character symbolic form or the numeric mode (octal) to avoid ambiguity.

See also: File permissions, chmod, symbolic mode, numeric mode, Unix-like systems.