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Re: Future shell work - comments reqyuested
Robert Elz <kre%munnari.OZ.AU@localhost> wrote:
|I have more or less finished work on shell arithmetic, completing the
|currently missing (not posix required, but allowed) operators, that is
|the unary ++, -- (prefix & postfix) and the ',' operator. There's
|nothing much to say (or ask) about that, but...
A pretty impressive run, if that comment is allowed!
|Second, the -i (iinteractive) flag to sh is handled quite strangely on
|the command line. After the shell has started it can be turned on or
|off at will (doing so is not often an intelligent thing to do, but it
|does have some uses.) But on the command line, unlike all other options,
|it cannot simply be set - the shell deduces it is interactive when input
|is from stdin, and stdin and stdout are ttys, and -i can be set, but only
|in conjunction with -s.
I think the standard says IN and ERR rather than IN and OUT for
this condition?! One more problem i cannot handle in my MUA
(currently, for the upcoming release), which unfortunately uses IN
and OUT for that purpose. My console library used out and err, in
fact it seems i never understood why this should be in and err,
i think i thought use cases like "< template prog" to start into
interactive mode should be valid.
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
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