__/ [Norman L. DeForest] on Sunday 18 September 2005 11:38 \__
> On Sat, 17 Sep 2005, Toby Inkster wrote:
>
>> Toby Inkster wrote:
>>
>> > # cat ~tai/jukebox-2.19b.pl >/usr/bin/jukebox.pl
>> > # cp ~tai/jukebox-2.19b.pl /usr/bin/jukebox.pl
>>
>> First one: /usr/bin/jukebox.pl keeps its existing permissions; second
>> one: it takes its permissions from ~tai/jukebox-2.19b.pl. So the first
>> one saves me having to chown and chmod.
>
> OK, my wild guess (written before I read this post since I have Pine sort
> by subject) was wrong.
Well, I thought it was a cunning suggestion nonetheless. I could not ever
imagine that a directory with .pl or even a dot in it would exist by
default, i.e. without intervenation from an eccentric user.
Toby, the big question is: did you /intentionally/ choose one over the
other, or was your riddle a side-effect? Answer only if you can be arsed.
[Norman L. DeForest] on Sunday 18 September 2005 11:25:
> A wild guess:
>
> If the system had a directory named "jukebox.pl" in the /user/bin
> directory, then I suspect that this:
>
> # cat ~tai/jukebox-2.19b.pl >/usr/bin/jukebox.pl
>
> would fail (I don't think you can redirect STDOUT to a directory but
> don't have a Unix/Linux box to check this) while this:
>
> # cp ~tai/jukebox-2.19b.pl /usr/bin/jukebox.pl
>
> would end up creating a file, /usr/bin/jukebox.pl/jukebox-2.19b.pl
> since the target of the cp command can be a filename or a directory name.
>
> So If you really wanted a copy of ~tai/jukebox-2.19b.pl to end up being
> /usr/bin/jukebox.pl then the cat command would do what you intend or
> give you an error message if it's not possible while the cp command
> could end up doing something else with no error message at all.
>
> Norman "also wondering what would happen if /usr/bin/jukebox.pl
> was a symbolic link or was pointed to by a symbolic
> link before a cat or cp command was issued" De Forest
Roy
--
Roy S. Schestowitz | Prevalence does not imply ideali$M
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