From: Sven Wischnowsky <wischnow@informatik.hu-berlin.de>
To: zsh-workers@sunsite.auc.dk
Subject: Re: "[[" (Re: PATCH: _urls again (Re: setopt localoptions noautoremoveslash))
Date: Mon, 18 Oct 1999 08:59:42 +0200 (MET DST) [thread overview]
Message-ID: <199910180659.IAA20535@beta.informatik.hu-berlin.de> (raw)
In-Reply-To: "Bart Schaefer"'s message of Sat, 16 Oct 1999 15:33:46 +0000
Bart Schaefer wrote:
> PWS says in http://www.ifh.de/~pws/computing/zshguide02.html#l6
>
> Second aside for users of sh: you may remember that tests in sh used
> a single pair of brackets, `if [ ... ]; then ...', or equivalently
> as a command called test, `if test ...; then ...'. The Korn shell
> was deliberately made to be different, and zsh follows that. The
> reason is that `[[' is treated specially, which allows the shell to
> do some extra checks and allows more natural syntax.
Here on zsh-workers we could probably say what the real difference is:
the parser knows about `[[ .. ]]' which should allow for faster
execution (I guess this is what Peter meant by `treated specially').
`[ .. ]' can only be handled as a normal builtin.
Bye
Sven
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
next reply other threads:[~1999-10-18 6:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-18 6:59 Sven Wischnowsky [this message]
-- strict thread matches above, loose matches on Subject: below --
1999-10-15 12:10 PATCH: _urls again (Re: setopt localoptions noautoremoveslash) Sven Wischnowsky
1999-10-15 15:30 ` Oliver Kiddle
1999-10-16 13:56 ` Tanaka Akira
1999-10-16 15:33 ` "[[" (Re: PATCH: _urls again (Re: setopt localoptions noautoremoveslash)) Bart Schaefer
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