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Date: Sun, 10 Nov 2013 08:07:21 -0500
From: Aaron Schrab <aaron@schrab.com>
To: zsh-users@zsh.org
Subject: Re: Curiosity... :)
Message-ID: <20131110130721.GD6807@pug.qqx.org>
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References: <20131110114648.GA3417@solfire>
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At 12:46 +0100 10 Nov 2013, meino.cramer@gmx.de wrote:
>just stumbled across this:
>
>Doing
>
>    /home/user/>..
>
>let me jump a directory in direction to the root.

You apparently have the AUTO_CD option enabled.  The description of that 
in the zshoptions(1) man page is:

  If  a  command is issued that can't be executed as a normal command, 
  and the command is the name of a directory, perform the cd command to 
  that directory.

There usually isn't a '..' command, but there's always a directory with 
that name, so that rule kicks in.

>But doing
>
>    /home/user/>.
>
>gives me:
>
>    .: not enough arguments
>    zsh: exit 1

But '.' is a builtin command name, so that command is run.  Since that's 
the first thing to be tried it doesn't matter that '.' is also a 
directory name.