From: malte@TechFak.Uni-Bielefeld.DE
To: rc@hawkwind.utcs.toronto.edu
Subject: Re: wishlist
Date: Tue, 25 May 1993 02:55:12 -0400 [thread overview]
Message-ID: <9305250655.AA28604@idefix.techfak.uni-bielefeld.de> (raw)
In-Reply-To: Mail from 'Alan Watson <alan@oldp.astro.wisc.edu>' dated: Mon, 24 May 1993 21:43:43 -0400
In response to Alan Watson <alan@oldp.astro.wisc.edu>:
(a) Here strings: use "echo 'foo' | bar" instead of "bar <<< 'foo'"
For more complex cases, like "bar <<<[0]'foo0' <<<[1]'foo1'" use "echo
'foo0' |[1=0] { echo 'foo1' |[1=1] bar }"
Well, I made this mistake too:
echo 'foo' != 'foo'
but
echo -n 'foo' == 'foo'
I think it's too much typing ( see answer to backqoutes ). But I wouldn't
bother if here string were removed because I don't use them anyway.
(b) The flattening operator: use a function instead
rc lists are always flat, so reading your function definition, I assume
you mean joining a lists elements into a single element. If this is the case
use
fn flatten {$1=``(){echo -n $$1}}
because your flattening function uses the flattening operator it tries to
replace.
(c) `` backquote substitution: use
Yes, this will surely simplify the parser, but in my experience simplicity
is not the ultimate goal. In a real worlds shell you have to watch for
conveniencies, too. Whenever I try to persuade people to use rc, after
a while they'll complain about too much typing because of oversimplified
quoting rules. That's why I asked for backslash escapes. I like the "``"
mechanism very much. And besides, what should be The Right Thing to do
; ifs = () { echo $#ifs $ifs }
0
or
1
I mean, should ifs be unset or set to an empty list ? What does it mean if
ifs not set ? If set to an empty list, this would be different from every
other variable.
(d) newpgrp: use a wrapper around rc
You'll loose the history list when using readline or editline.
And another thing that hasn't been discussed here: What about compatibility
with plan 9 rc ?
Malte
next parent reply other threads:[~1993-05-25 6:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <alan@oldp.astro.wisc.edu>
1993-05-25 6:55 ` malte [this message]
1993-05-25 9:16 ` wishlist John Mackin
1993-05-26 17:49 wishlist Tom Culliton x2278
-- strict thread matches above, loose matches on Subject: below --
1993-05-26 17:29 wishlist Alan Watson
1993-05-26 17:26 wishlist Alan Watson
1993-05-26 16:59 wishlist Tom Culliton x2278
1993-05-26 6:57 wishlist Bengt KLEBERG
1993-05-26 17:51 ` wishlist Chris Siebenmann
1993-05-26 19:04 ` wishlist mycroft
1993-05-26 3:08 wishlist Alan Watson
1993-05-26 3:02 wishlist Byron Rakitzis
1993-05-26 3:06 ` wishlist Scott Schwartz
1993-05-25 23:58 wishlist Tom Culliton x2278
1993-05-25 21:29 wishlist Alan Watson
1993-05-25 1:43 wishlist Alan Watson
1993-05-24 16:13 wishlist Erik Quanstrom
1993-05-24 15:17 wishlist Tom Culliton x2278
1993-05-22 0:43 wishlist Scott Schwartz
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