#chmod

This documents version 0.2.1. The support record tracks platform verification and exact-version publication evidence separately.

Change Unix-style permission bits through the public MoonBit filesystem API on POSIX hosts. Supports octal modes, -R/--recursive, and -v/--verbose. Numeric modes follow symbolic links named as command-line operands and change their targets. Links encountered while walking a real directory with -R are skipped. Recursive traversal through a command-line directory symlink is not implemented: only that target's own mode is changed.

Closed symbolic assignments such as a=rwx or u=rw,g=r,o= are supported for regular files. They must explicitly assign all of u, g, and o; operands are checked for this subset before mutation. Incremental +/-, omitted classes, X/s/t, permission copies, directories and symlinks remain rejected for symbolic assignments. Numeric operations process operands in order and do not roll back earlier successful changes on a later error.

--reference is recognized but fails before mutation because async 0.22.4 does not expose current permission bits. Windows permission mutation is unavailable in this profile. Host permission denial is reported separately from these implementation limits.

#Standalone metadata

Standalone --version prints exactly chmod 0.2.1 followed by one newline. Standalone --help starts with Usage: chmod, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

Source Files

main.mbt

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