diff --git a/runcoms/zlogin b/runcoms/zlogin
index 30549f33..16fae45e 100644
--- a/runcoms/zlogin
+++ b/runcoms/zlogin
@@ -14,10 +14,13 @@
   fi
 } &!
 
-# Print a random, hopefully interesting, adage.
-if (( $+commands[fortune] )); then
-  if [[ -t 0 || -t 1 ]]; then
+# Execute code only if STDERR is bound to a TTY.
+[[ -o INTERACTIVE && -t 2 ]] && {
+
+  # Print a random, hopefully interesting, adage.
+  if (( $+commands[fortune] )); then
     fortune -s
     print
   fi
-fi
+
+} >&2
diff --git a/runcoms/zlogout b/runcoms/zlogout
index 7c27e885..56b6b551 100644
--- a/runcoms/zlogout
+++ b/runcoms/zlogout
@@ -5,9 +5,14 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
+# Execute code only if STDERR is bound to a TTY.
+[[ -o INTERACTIVE && -t 2 ]] && {
+
 # Print the message.
 cat <<-EOF
 
 Thank you. Come again!
   -- Dr. Apu Nahasapeemapetilon
 EOF
+
+} >&2