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Re: "[[" (Re: PATCH: _urls again (Re: setopt localoptions noautoremoveslash))

X-seq: zsh-workers 8311
From: Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>
To: zsh-workers@xxxxxxxxxxxxxx
Subject: Re: "[[" (Re: PATCH: _urls again (Re: setopt localoptions noautoremoveslash))
Date: Mon, 18 Oct 1999 08:59:42 +0200 (MET DST)
In-reply-to: "Bart Schaefer"'s message of Sat, 16 Oct 1999 15:33:46 +0000
Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm

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@xxxxxxxxxxxxxxxxxxxxxxx

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