From: M Douglas McIlroy <m.douglas.mcilroy@dartmouth.edu>
To: tuhs@minnie.tuhs.org
Subject: [TUHS] [TUHS} Qed vs ed
Date: Sun, 31 Jan 2021 10:26:22 -0500 [thread overview]
Message-ID: <CAKH6PiWw05khmvSaY0eXuUfWm+h8dR3HxQ9-XrLz09EvnA4k1Q@mail.gmail.com> (raw)
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I used Ken's qed in pre-Unix days. I understand its big departure from the
original was regular expressions. Unix ed was the same, with
multi-file capability dropped. Evidently the lost function was not much
missed, for it it didn't come back when machines got bigger. I remember
that fairly early in PDP-11 development ed gained three features: & in the
rhs of substitutions plus k and t commands. (I'm not sure about &--that was
50 years ago.).
With hindsight it's surprising that a "minimalist" design had m but not t,
for m can be built from t but not vice versa. A cheat sheet for multics qed
is at h
<http://www.bitsavers.org/pdf/honeywell/multics/swenson/6906.multics-condensed-guide.pdf>
ttp://
www.bitsavers.org/pdf//honeywell/multics/swenson/6906.multics-condensed-guide.pdf.
It had two commands I don't remember: sort(!) and transform, which I assume
is like y in sed.
Doug
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next reply other threads:[~2021-01-31 15:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-31 15:26 M Douglas McIlroy [this message]
2021-02-01 4:24 M Douglas McIlroy
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