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Implement the Linux cp command, then explain what happens underneath

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MicrosoftCodingLast asked Sep 2026

Write a version of cp that copies a file to a destination. Then expect the discussion to go deep: system calls versus buffered I/O, buffer sizes, file descriptors and permissions, partial writes and error handling, copying directories, and the C++ details of your implementation (RAII, exceptions, std::filesystem).

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