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Re:File Transfer with SSH, Tee, and Base64 by JadeNB on Thursday September 17, 2020 @12:15PM (#24506489)
Based on an offhand comment at https://www.extraputty.com/features/zmodem.html, they were `sz` and `rz`.

Wikipedia (https://en.wikipedia.org/wiki/ZMODEM) says that this came out of the BBS days. Boy, that takes me back.

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