diff --git a/bin/compose-core b/bin/compose-core
index 5a154bf..5bb9b88 100755
--- a/bin/compose-core
+++ b/bin/compose-core
@@ -136,6 +136,13 @@ read-0-err() {
         false
     }
 }
+export -f read-0-err
+
+p-err() {
+    "$@"
+    echo "$?"
+}
+export -f p-err
 
 
 wyq() {