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lrzsz 0.12.21rc, released by trzsz, is a compact command-line utility set that resurrects the classic ZMODEM, XMODEM, and YMODEM protocols for reliable file exchange over serial links, SSH, or any byte-stream connection. Originally written for Unix-like systems, the package provides the lrz (receive) and lsz (send) binaries that negotiate batch transfers, resume interrupted downloads, and apply 16-bit CRC validation to each 1 kB block, giving administrators, embedded developers, and retro-computing enthusiasts a low-overhead alternative to scp or ftp when bandwidth is tight or only a terminal window is available. Typical use cases include pushing firmware images to headless routers, pulling logfiles from remote switches, cross-compiling toolchains to legacy minicomputers, or simply exchanging archives between a modern laptop and a 1980s micro running a BBS. Because the protocols operate over plain stdio, lrzsz integrates cleanly with screen, tmux, minicom, or any POSIX shell, requiring no additional daemon or root rights; invocation is as simple as piping output to lsz or redirecting lrz input, after which automatic file-list negotiation begins. The single-version 0.12.21rc streamlines the codebase to focus on stability and compatibility, retaining the familiar rz/sz command aliases while quietly fixing corner-case timeouts and 7-bit serial modes. As a result, the tool remains a standard component in many Linux distributions’ “comm” or “misc” repositories and is frequently packaged with Docker containers that need to seed content without an SSH server. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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