[X-Unix] Weird tcsh vs bash behavior

[Kirk McElhearn]

On 2/19/04 4:57 PM, "James Bucanek" <subscriber at gloaming.com> wrote:

>> But running the same command while in bash doesn't work - is there something
>> I'm missing? Does bash not see the /rsrc files? Or is it something to do
>> with the way it globs?
> 
> It's not the way the shells glob.  It's probably the way in which they try to
> resolve the resulting paths.
> 
> The magic '/rsrc' isn't really a file -- at least it doesn't have a
> traditional entry in the UNIX directory structure.  It's a "synthetic" file
> who's parent "directory" is the file that contains the resource data.  Note
> that you can also use the synthetic naming convention
> '<filename>/..namedfork/rsrc'.
> 
> So, let's take the example "*/rsrc".  If the shell reads the current directory
> and matches all the entries it can find against '*' (both files and
> directories), then systematically tests each possible <filename>/rsrc using
> stat(), or some similar call, then it will find all of the synthetic */rsrc
> files in the directory.
> 
> However, if a shell tries to be "smart" it might first exam the type of each
> entry that matches the '*'.  As it examines each match, it's going to see that
> they are all files, so it could safely eliminate it as a potential match
> because files aren't directories, and therefor can't contain children.
> 
> I suspect that tcsh is blindly trying each <filename>/rsrc to see if it
> exists, and bash is looking at <filename>, sees that it's a file, and skips
> it.

Well, that makes sense, sort of... I do understand that it's more the
weirdness of HFS+ and resource forks than the actual file system though. So,
to sum up, bash can't do what tcsh can do here.
 
 
Kirk
 
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