1 files changed, 5 insertions, 0 deletions
diff --git a/sshtool b/sshtool
index 262f0e3..24c19af 100755
--- a/sshtool
+++ b/sshtool
@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 
 CMDFILE="$1"
+if [ -z "$CMDFILE" ] || [ ! -f "$CMDFILE" ]; then
+	echo "sshtool is not meant to be called on its own."
+	echo "See scripts that use it (e.g. deploy_nixos) for usage examples."
+	exit 1
+fi
 shift 1
 
 cd $(dirname $CMDFILE)