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The Zmodem protocol is a robust and fast data-transfer protocol. It includes 32-bit cyclic redundancy checking (CRC) to ensure error-free data transfer. On Unix platforms, the RZSZ package provides the dominant tools for implementing Zmodem protocols. Related protocols, such as Xmodem and Ymodem, are also supported by commands that are part of the RZSZ package.
These commands are available in the current RZSZ package: