which package a file belongs to

Matthew Flaschen matthew.flaschen at gatech.edu
Sun Jan 18 19:13:27 UTC 2009

Nils Kassube wrote:
>>> Sorry, I don't understand why it shouldn't work. Here both commands
>>> have the same output.
>> Nothing is being passed to the cut command, so first you get:
>> cut: -: Input/output error
>> then dpkg -l gets no other parameters so prints everything.
> Now its getting interesting :)


> While your explanation seems logical, the command did work on my machine. 

Yeah, it works in dash and bash.  Apparently, this is an inconsistency
in zsh, my favorite shell. :(

> $ echo hello | ls $(cut -f1)
> ls: cannot access hello: No such file or directory

That's weird.  It seems wrong to me to parse it that way.  However, both
bash and dash do do it that way.  A simpler test case is:

echo hello | echo $(cat)

zsh give:

cat: -: Input/output error

bash and dash both give hello.

> Like I wrote above, I have tested my version also and here it works. Could 
> it be that you don't use bash but some other shell?

I was very surprised that this made a difference.  Even with zsh
emulating sh it acts the same.  Unfortunately, I don't know enough to
say whether this is a bug or "implementation detail".

However, I would say regardless the explicit version I gave is better.

Matt Flaschen

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