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Re: Strange bash complementation behavior


From: Paul Jarc
Subject: Re: Strange bash complementation behavior
Date: Wed, 12 Jan 2005 10:42:37 -0500
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux)

Erik Wasser <address@hidden> wrote:
> % ls -dl perl projects projects/perl
> lrwxrwxrwx    1 fuzz users   13 Jan  9 00:21 perl -> projects/perl
> drwxrwxr-x   15 fuzz fuzz  4096 Jan 11 14:12 projects
> drwxr-xr-x  108 fuzz fuzz  8192 Jan 11 15:48 projects/perl
> % cd perl
> % ls ../proj<TAB>
>
> the complementation turns this into 'ls ../projects<SPACE>'. Why is 
> there a <SPACE> (instead of a '/')?

Since you are actually in the projects/perl directory, there is no
../projects, and ls will tell you that.  bash is warning you about
this here, in a way.  bash knows what path you used to reach this
directory, so it can pretend that ../projects exists, but that path
won't be meaningful to other programs, since they only see the current
state, and not your history.

> Where is the error? I think 'cd' is a shell builtin and interpretes the 
> '..' in a different way than the shell command 'ls'.

Yes.  cd is a builtin command, so it can take advantage of extra
information, which isn't available to ls.


paul




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