-[ -n "$d" ] || d=..
-tail -n 2 "$d/README" > logfile.gnu
-busybox tail -n 2 "$d/README" > logfile.bb
-cmp logfile.gnu logfile.bb
+echo -ne "abc\ndef\n123\n" >input
+echo -ne "def\n123\n" >logfile.ok
+busybox tail -2 input > logfile.bb
+cmp logfile.ok logfile.bb