#cksum for moonx

The cli/cksum@0.1.0 candidate computes the POSIX CRC-32 checksum and byte count for standard input or each file operand. Its output is:

CHECKSUM BYTES FILE

With no operand, or with -, input is read from standard input. Multiple operands are processed in order; an unreadable operand is reported to stderr, the remaining operands are still attempted, and the command exits with status

The checksum is computed as the CRC-32 polynomial 0x04c11db7 over the input, followed by the low-order bytes of the input length, and then bitwise complemented.

--help and --version are supported. GNU alternate algorithms (-o), tagged output, and other non-POSIX extensions are outside this release and are rejected as unsupported options with status 2. The implementation is pure MoonBit and uses public async Reader/File APIs on Native and Wasm.

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