grep - invalid argument

[Jerry Rocteur <jerry.rocteur@xxxxxxxxx>]

Hi,

Does anyone know which zsh setting would make grep give error:

grep: xxx: Invalid argument

Where xxx is a subdirectory of where you are running your grep from ?

Note that we are running zsh in ksh compatibility mode:

ls -l $SHELL
lrwxrwxrwx 1 root root 8 Sep 25  2009 /bin/ksh -> /bin/zsh

echo $ZSH_VERSION
4.2.6

Thanks in advance,

Jerry