fixup

src/sum.sh

@@ -1,18 +1,9 @@
 # /etc/profile.d/sum.sh
 
 # Ensure the script is sourced, not executed
-if [ -n "$ZSH_VERSION" ]; then
-  # For zsh
-  if [[ "${(%):-%x}" == "$0" ]]; then
-    echo "This script should be sourced, not executed."
-    return 1
-  fi
-else
-  # For bash
-  if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
-    echo "This script should be sourced, not executed."
-    return 1
-  fi
+if [[ "$0" == "${BASH_SOURCE[0]}" ]] || [[ "$0" == "${(%):-%x}" ]]; then
+  echo "This script should be sourced, not executed."
+  return 1 2>/dev/null || exit 1
 fi
 
 # Function to generate SHA-256 hashes for .sh files in a given directory