--- src/shell/jython.orig	2017-08-11 16:24:32.831309328 +0100
+++ src/shell/jython	2017-08-11 16:23:55.346726416 +0100
@@ -242,6 +242,11 @@
   fi
 fi
 
+# Detect absence of tty
+if ! tty -s; then
+  JAVA_OPTS="$JAVA_OPTS -Dpython.launcher.tty=false"
+fi
+
 if [ -n "$profile_requested" -o -z "$boot_requested" ] ; then
   [ -n "$profile_requested" ] && echo "Running with instrumented profiler"
   java_args=("${java_args[@]}" -classpath "$CP$CP_DELIMITER$CLASSPATH")
