[TUHS] # (was Re: sh: cmd | >file)
Warner Losh
imp at bsdimp.com
Tue Jan 7 10:39:39 AEST 2020
On Mon, Jan 6, 2020 at 3:51 PM Dave Horsfall <dave at horsfall.org> wrote:
> On Mon, 6 Jan 2020, Brian Walden wrote:
>
> > csh(1) was wrtten around 1978 and yes # as a comment was only for
> > scrtipts, think it was why would you need to comment interactively?
>
> Why would you *not* want to? You've just made "#" asymmetric in its
> behaviour; in the meantime the parser just sees an unescaped "#" and
> ignores everything after that, without regard to context.
>
> You might also be using "script" e.g.
>
> script
> blah blah
> # Now here I do something funky
> *really* funky stuff
> ^D
>
Or you might have cut and paste the commands from a script to test
something, or to redo something by hand that failed for some reason.
Warner
> [...]
>
> > Also before you say wait! ALGOL uses # as comment and is older than
> > Kernighan' ratfor(1). [...]
>
> Funny; I recall ALGOL using "comment ... ;" or was that ALGOLW (which I
> loved using; I wish I still had my ALGOLW book)?
>
> -- Dave
>
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