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From: Frank Terbeck <ft@bewatermyfriend.org>
To: Lyre <4179e1@gmail.com>
Cc: zsh-users@zsh.org
Subject: Re: string equal problem
In-Reply-To: <87oc5n9tt4.fsf@ft.bewatermyfriend.org> (Frank Terbeck's message
	of "Mon, 07 Mar 2011 10:13:59 +0100")
References: <AANLkTi=GJPW=cVoA5hxbgVLsVMpeFehiZFjjU-dd04ow@mail.gmail.com>
	<87oc5n9tt4.fsf@ft.bewatermyfriend.org>
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Date: Mon, 07 Mar 2011 10:27:19 +0100
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Frank Terbeck wrote:
> Lyre wrote:
>> To my surprise=EF=BC=8Cthe following statment:
>>
>> if [ "abc" =3D=3D "def" ]; then echo y; else echo n; fi
>>
>> doesn't work, it says "zsh: =3D not found".
>
> `=3D=3D' only works in "[[ ... ]]". [...]

Actually, that's not quite true.

`[' works like a command, thus =3D=3D is seen like it is for any other
command too. And in those cases, the leading equal leads to expansion of
the corresponding program's full path. For example

zsh% print =3Demacs
/usr/bin/emacs

Now, there is no command "=3D" on your system, which is why you're getting
the correct message "=3D not found". To prevent this, you can either unset
the `EQUALS' option (man zshoptions | less -p EQUALS) or quote the
string that is otherwise subject to this expansion. As in:

       if [ 'abc' '=3D=3D' 'def' ]; then

Regards, Frank

--=20
In protocol design, perfection has been reached not when there is
nothing left to add, but when there is nothing left to take away.
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