#cksum for moonx

Version 0.1.3 behavior is documented here. The support record separates local verification from published MoonX behavior; moonx examples use registry releases.

Compute the POSIX CRC-32 checksum and byte count:

printf 'hello' | moonx cli/cksum
moonx cli/cksum input.bin

With no operand, or with -, standard input is read. Multiple operands are processed in order; later file failures do not hide earlier results and produce an eventual nonzero status. --help and --version are available.

-a/--algorithm selects bsd, sysv, crc, crc32b, md5, sha1, sha224, sha256, sha384, sha512, sha2, sha3, blake2b, and sm3. SHA2 and SHA3 require -l/--length 224, 256, 384 or 512 when hashing. BLAKE2b supports every multiple of eight from 8 through 512; zero selects its 512-bit default. Legacy algorithms print their decimal checksum and byte/block count. Modern algorithms print BSD tagged records by default; --untagged selects GNU checksum records. --base64 changes the modern digest encoding, and --raw writes only digest bytes for one input. Legacy raw digests use big-endian order. -z/--zero ends records with NUL and disables filename escaping.

-c/--check verifies modern tagged records, automatically selecting their algorithm unless -a is specified. With an explicit modern algorithm it also accepts untagged records; SHA2, SHA3 and BLAKE2b lengths are inferred from each record. Like GNU, explicit SHA2 checking locks to the first fixed SHA tag in a manifest; omit -a to check a mixture of fixed SHA tags. Hexadecimal and Base64 digests are accepted. Legacy checksum formats cannot be verified. --quiet, --status, -w/--warn, --strict and --ignore-missing follow the sum commands. At least one digest must match, including when missing files are ignored. Status mode still reports read errors. Explicit --tag, -b/-t and -z are invalid while checking.

Hash input uses bounded buffers, including SHA3 and BLAKE2b; manifests are read one line at a time. Backslash, LF and CR in modern record filenames are escaped. Binary and text flags select record markers; neither translates input bytes on Windows. --base64 and --raw conflict, and text output requires --untagged. Exact-version publication evidence is tracked separately in the support record.

#Standalone metadata

Standalone --version prints exactly cksum 0.1.3 followed by one newline. Standalone --help starts with Usage: cksum, 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.

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