Re: grep-dir test

[Paolo Bonzini]

On 12/20/2011 06:20 AM, Eli Zaretskii wrote:
> > >  The intent of the test is that grep should behave differently when
> > >  operating on a directory instead of a regular file.
> Can you elaborate on that difference in behavior?  I mean the
> difference between
>
>    echo foo | grep -f empty-directory/

This should be a hard failure.  Asking grep to open a directory and 
search for patterns in it is wrong.

> and
>
>    echo foo | grep -f empty-file

This should search for "no pattern", and hence print nothing but still 
consume the input.

So, these should print nothing:

    echo foo | grep -f /dev/null
    echo foo | (grep -f /dev/null; cat)

This should print an error message:

    echo foo | grep -f /

This should print an error message followed by "foo":

    echo foo | (grep -f /; cat)

If you get XPASSes from the last two on Windows, that's good. :)  It's 
working better than POSIX. :)

Paolo