Oh shoot, I knew in my search for a link I could share this at (my own digital copy is of less than perfect quality, and is in a format that doesn't allow viewing inside of WWW browsers, so I just picked the one from McIllroy's site) I had missed something. Yeah, absolutely check the fully copy, it's pretty fantastic.
Sending a message to hn@yc to try and get the link changed.
some people at cat-v.org were interested in this and there happened to be a copy at stanford library where a roommate of mine was working at the time. he borrowed it on my behalf and i used the book scanner at noisebridge in san francisco (constructed from wood and two canon cameras and a python script) to image it, and uploaded it to archive.org.
My scan of the print edition (kindly mailed to me many years ago by Doug McIlroy), which includes the historical manpages as well as the commentary: https://archive.org/details/research-unix-reader/
Not entirely true, but almost! The DNS hierarchy didn't exist until a (very) late version of UNIX, and if I remember right, most mail used ! instead of @ and .
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[ 3.4 ms ] story [ 40.4 ms ] threadSending a message to hn@yc to try and get the link changed.
some people at cat-v.org were interested in this and there happened to be a copy at stanford library where a roommate of mine was working at the time. he borrowed it on my behalf and i used the book scanner at noisebridge in san francisco (constructed from wood and two canon cameras and a python script) to image it, and uploaded it to archive.org.
Even without sendmail rewriting, some systems (e.g. MHSnet/ACSNET) used `@` natively IIRC.