Index: simulator/run.sh
===================================================================
diff -u -rc5a7028efbf4a343a6ce3d92d3d534a5e15d784c -r54b36df20b79ef68cda0bea774488ad958483e20
--- simulator/run.sh	(.../run.sh)	(revision c5a7028efbf4a343a6ce3d92d3d534a5e15d784c)
+++ simulator/run.sh	(.../run.sh)	(revision 54b36df20b79ef68cda0bea774488ad958483e20)
@@ -1,5 +1,11 @@
 #!/bin/sh
-cd ~/Projects/testsuites/simulator/
-. ~/Projects/testsuites/venv/bin/activate
-export PYTHONPATH=~/Projects/testsuites/shared/scripts/
+# make sure the script is sourced and not executed directly
+if [ "$0" = "$BASH_SOURCE" ]; then
+    echo "Error: Script must be sourced"
+    exit 1
+fi
+
+cd $HOME/Projects/testsuites/simulator/
+. $HOME/Projects/testsuites/venv/bin/activate
+export PYTHONPATH=$HOME/Projects/testsuites/shared/scripts/
 python3 ./run.py