I don't know, whether '&' was there from the day one? Something semantically equal should have present in McIlroy's mind certainly, but implementation? > "Some

I don't know, whether '&' was there from the day one? Something semantically equal should have present in McIlroy's mind certainly, but implementation? > "Somewhere at that time I talked of a macro as a 'switchyard for data streams,' and there's a paper hanging in Brian Kernighan's office, which he dredged up from somewhere, where I talked about screwing together streams like a garden hose" > "And over a period from 1970 to 1972, I'd from time to time say, 'How about making something like this?', and I'd put up another proposal, another proposal, another proposal. And one day I came up with a syntax for the shell that went along with the piping" > "I remember the preposterous syntax, the ">,>" or whatever the syntax that everyone came up with, and then all of a sudden there was the vertical bar '|' and just everything clicked at that point," he said. The bar was the syntax that made pipes work" https://web.archive.org/web/20001214172500/http://www.bell-labs.com:80/history/unix/philosophy.html https://web.archive.org/web/20001214172500/http://www.bell-l... E.g. stderr had not been implemented from the start - http://minnie.tuhs.org/pipermail/tuhs/2017-September/010406.html http://minnie.tuhs.org/pipermail/tuhs/2017-September/010406....