Regarding (info "(grep) Context Line Control") To get exactly this great output $ seq 33|grep --context=4 --label= --with-filename 5$ without further tips on the page, the user won't figure it out.
Even worse, if the input is from a file, not stdin, even I can't figure it out. (P.S., to be sure we are both looking at the same thing $ seq 33|grep --context=4 --label= --with-filename 5$|cksum 1444160178 105 )
