Re: Grep --directories option

[Alfred M. Szmidt]

   I think that on the GNU/Hurd, the read behaviour is more favorable.
   It allows for scenarios like the above, without adding a lot of
   noise to greps output in case you have a match with a directory
   content.  On systems where opening a directory always fails, the
   error output of grep tends to annoy me, though.  On such systems I
   would prefer skip to be the default behaviour.  How to
   differentiate these systems I don't know, maybe a "mkdir foo; cat
   foo"?  Or just using host_os

cat works differently on GNU/Linux and GNU/Hurd, might be worth taking
a peek at how it does this stuff.