Hi, how to found into string 2 or more word, only if are all present? % echo "aa bb cc dd"|egrep -q '(bb|dd)' && echo found This command show "found" if bb OR dd are in string. But if I want show "found" only if bb AND dd are present into string. What egrep (or sed) command I must use? Many thanks for your reply! -- Dario Lesca <d.lesca at solinos.it>