diff -r 5e0fc4f25c44 -r 0fde44ae8f1d redisplay
--- a/redisplay	Wed Feb 12 22:39:50 2014 +0100
+++ b/redisplay	Wed Feb 12 22:54:50 2014 +0100
@@ -24,15 +24,17 @@
     my $user = $ENV{USER} // $ENV{LOGNAME} // getpwuid $>;
     my $host = hostname;
 
-    open my $qr, '|qrencode -t ansi256'
-      or die "$0: Can't open qrencode: $!\n";
+    open(my $o, '>&STDOUT');
+    if (-t STDIN) {
+        open STDOUT, '|qrencode -t ansi256'
+          or die "$0: Can't open qrencode: $!\n";
+    }
 
-    $qr->printf(
-        "otpauth://%sotp/%s?secret=%s\n", $method,
-        url_encode("$user\@$host"),       $secret
-    );
+    printf "otpauth://%sotp/%s?secret=%s\n", $method,
+      url_encode("$user\@$host"), $secret;
 
-    close $qr;
+    close(STDOUT);
+
 }
 
 exit main unless caller;