most extreme grep challenge

% ls
abc abcd q
% grep --version
grep (GNU grep) 2.5.1
% ls | grep ______
abc
========================================
Fill in the blank and no flags fags.  I will judge all entries,
and decide upon the winrars.

>>6
By default, ls lists one entry per line to standard output; the excep-
tions are to terminals or when the -C or -x options are specified.

>>8
no flags

>>1
`echo 'printf"%x\$",2+exp(4*atan2 1,1)>>1'|perl`