testing "head, stdin" "head -n 1 && echo yes" "one\nyes\n" "" "one\ntwo"
testing "head, stdin via -" "head -n 1 - && echo yes" "one\nyes\n" "" "one\ntwo"
testing "head, file" "head input -n 1 && echo yes" "one\nyes\n" "one\ntwo" ""
+testing "head -number" "head -2 input && echo yes" "one\ntwo\nyes\n" \
+ "one\ntwo\nthree\nfour" ""
testing "head, default lines" "head" "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" "" "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12"
echo "foo