-cmp $d1/hosts/foo $d2/hosts/foo
-cmp $d1/hosts/foo $d3/hosts/foo
-cmp $d1/hosts/bar $d2/hosts/bar
-cmp $d1/hosts/bar $d3/hosts/bar
-cmp $d1/hosts/baz $d2/hosts/baz
-cmp $d1/hosts/baz $d3/hosts/baz
+diff -w "$DIR_FOO/hosts/foo" "$DIR_BAR/hosts/foo"
+diff -w "$DIR_FOO/hosts/foo" "$DIR_BAZ/hosts/foo"
+diff -w "$DIR_FOO/hosts/bar" "$DIR_BAR/hosts/bar"
+diff -w "$DIR_FOO/hosts/bar" "$DIR_BAZ/hosts/bar"
+diff -w "$DIR_FOO/hosts/baz" "$DIR_BAR/hosts/baz"
+diff -w "$DIR_FOO/hosts/baz" "$DIR_BAZ/hosts/baz"