Douglas McIlroy conceived the notion of the "pipe" which Ken Thompson added to Version 3 Unix in 1973. The | character wasn’t associated with it until Version 4 Unix in 1978.
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TC39 Proposal readme:
So currently the Hack pipes proposal is the only one in the running (stage 2; no OCaml-style reverse-application operator).
Aside: Archeological Semiotics: The Birth of the Pipeline Symbol, 1994
Douglas McIlroy conceived the notion of the "pipe" which Ken Thompson added to Version 3 Unix in 1973. The
|character wasn’t associated with it until Version 4 Unix in 1978.