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--- features:pipes [2015/12/29 20:33] – [Dating the Creation of Pipes] admin
+++ features:pipes [2022/09/16 18:47] (current) – old revision restored (2022/09/10 20:43) 123.219.209.121
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 The idea of connecting an output from one process, via an in-kernel memory buffer, to the input of another process is entirely original to Unix.
-Doug McIlroy, in 1964, had proposed that "We should have some ways of connecting programs like garden hose – screw in another segment when it becomes necessary to massage data in another way. This is the way of IO also." (Dennis Ritchie, [[https://www.bell-labs.com/usr/dmr/www/mdmpipe.html|Advice from Doug McIlroy]]). Implicit in this statement is the idea of //filters// to modify and "massage" the data.
+Doug McIlroy, in 1964, had proposed that "We should have some ways of connecting programs like garden hose – screw in another segment when it becomes necessary to massage data in another way. This is the way of IO also." (Dennis Ritchie, [[https://www.bell-labs.com/usr/dmr/www/mdmpipe.html|Advice from Doug McIlroy]])
 ===== The Evolution of Pipes =====
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 According to the [[:anecdotes:pipes|anecdotes]], Ken Thompson added pipes to Unix in one day.
-The Second Edition of Unix, dated June 1972, didn't have pipes; by January 15, 1973, Unix did have pipes. Doug McIlroy put out the notice for a [[http://www.tuhs.org/Archive/Documentation/Papers/Unix_Users_Talk_Notes_Jan73.pdf|talk which described the state of UNIX]] at that time; page 4 describes SYS PIPE and its implementation. This is as narrow as we can get on the date when Ken added pipes to the system.
+The Second Edition of Unix, dated June 1972, didn't have pipes. By January 15, 1973, Unix did have pipes: Doug McIlroy put out the notice for a [[http://www.tuhs.org/Archive/Documentation/Papers/Unix_Users_Talk_Notes_Jan73.pdf|talk which described the state of UNIX]] at that time. Page 4 describes SYS PIPE and its implementation. This is as narrow as we can get on the date when Ken added pipes to the system.