If I'm remembering correctly, miniunix didn't have pipes. The shell faked it by taking the output of the first program into a file and then using it as the input for the second. Didn't really multitask anyhow, so it was pretty much fine. -----Original Message----- From: TUHS [mailto:tuhs-bounces@minnie.tuhs.org] On Behalf Of Ian Zimmerman Sent: Monday, February 26, 2018 11:58 AM To: tuhs(a)minnie.tuhs.org Subject: Re: [TUHS] EOF on pipes? On 2018-02-26 23:03, Rudi Blom wrote: Is this a SCO speciality, or are there other UNIXes like that? Does it not even have pipe() in its libc?