diff --git a/.install/bin/pdm-build b/.install/bin/pdm-build
index 5be974c..43baab2 100755
--- a/.install/bin/pdm-build
+++ b/.install/bin/pdm-build
@@ -9,9 +9,9 @@ epoch=$(date +%s.%3N)
 today=$(date +%Y-%m-%d-T%H%M)
 
 badarg() {
-    echo -n "$(basename $0): "
-    echo "$1"
-    echo "Try '$(basename $0) -h' for more information."
+    echo -n "$(basename $0): " >&2
+    echo "$1" >&2
+    echo "Try '$(basename $0) -h' for more information." >&2
     exit 2
 }
 
diff --git a/.install/bin/pdm-launch b/.install/bin/pdm-launch
index e2e2da3..696689c 100755
--- a/.install/bin/pdm-launch
+++ b/.install/bin/pdm-launch
@@ -3,9 +3,9 @@
 set -eEuo pipefail
 
 badarg() {
-    echo -n "$(basename $0): "
-    echo "$1"
-    echo "Try '$(basename $0) -h' for more information."
+    echo -n "$(basename $0): " >&2
+    echo "$1" >&2
+    echo "Try '$(basename $0) -h' for more information." >&2
     exit 2
 }
 
@@ -64,7 +64,7 @@ if [[ $opt_config -eq 1 ]]; then
     echo "Getting deploy options from image metadata label '$opt_label' ..."
     deployconf=$(podman image inspect -f "{{ .Config.Labels.${opt_label} }}" "$image")
     if [[ $deployconf == "<no value>" ]]; then
-        echo "Error: could not find image metadata label '$opt_label'"
+        echo "Error: could not find image metadata label '$opt_label'" >&2
         exit 1
     fi
 else
diff --git a/.install/bin/pdm-shell b/.install/bin/pdm-shell
index 54f7664..edaf36d 100755
--- a/.install/bin/pdm-shell
+++ b/.install/bin/pdm-shell
@@ -3,9 +3,9 @@
 set -eEuo pipefail
 
 badarg() {
-    echo -n "$(basename $0): "
-    echo "$1"
-    echo "Try '$(basename $0) -h' for more information."
+    echo -n "$(basename $0): " >&2
+    echo "$1" >&2
+    echo "Try '$(basename $0) -h' for more information." >&2
     exit 2
 }