utf8opt-3 needs to be split in half, part of it needs-ctty

10x arekm again

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.473 2011/07/07 20:24:50 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.474 2011/07/07 21:02:39 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -5937,24 +5937,35 @@ expected-stdout:
 expected-stderr-pattern:
 	/(# )*/
 ---
-name: utf8opt-3
+name: utf8opt-3a
 description:
 	Ensure ±U on the command line is honoured
-	(this test may pass falsely depending on CPPFLAGS)
+	(these two tests may pass falsely depending on CPPFLAGS)
 stdin:
 	export i=0
 	code='if [[ $- = *U* ]]; then echo $i on; else echo $i off; fi'
 	let i++; "$__progname" -U -c "$code"
 	let i++; "$__progname" +U -c "$code"
+	echo $((++i)) done
+expected-stdout:
+	1 on
+	2 off
+	3 done
+---
+name: utf8opt-3b
+description:
+	Ensure ±U on the command line is honoured, interactive shells
+need-ctty: yes
+stdin:
+	export i=0
+	code='if [[ $- = *U* ]]; then echo $i on; else echo $i off; fi'
 	let i++; "$__progname" -U -ic "$code"
 	let i++; "$__progname" +U -ic "$code"
 	echo $((++i)) done
 expected-stdout:
 	1 on
 	2 off
-	3 on
-	4 off
-	5 done
+	3 done
 ---
 name: aliases-1
 description: