--- a/tests/test-discovery-obshashrange-cache.t	Wed Nov 21 10:47:07 2018 +0000
+++ b/tests/test-discovery-obshashrange-cache.t	Wed Nov 21 11:13:21 2018 +0000
@@ -28,7 +28,7 @@
   $ hg -R main debugbuilddag '.+7'
 
   $ for node in `hg -R main log -T '{node}\n'`; do
-  >     echo -n $node | grep -o . | sort |tr -d "\n" > ancfile
+  >     printf $node | grep -o . | sort |tr -d "\n" > ancfile
   >     anc=`cat ancfile`
   >     rm ancfile
   >     echo "marking $anc as predecessors of $node"