the standard & extended RE's don't find find NUL's:
dd if=/dev/zero of=zeros bs=4k count=1 command grep -Pq '\000\000' zeros && echo "badness"
badness
command grep -Eq '\000\000' zeros && echo "badness" command grep -Gq '\000\000' zeros && echo "badness" command grep -q '\000\000' zeros && echo "badness" rpm -q grep
grep-2.20-2.4.1.x86_64
