message: script: redirecting stderr to stdout before pipelining into grep
diff: @@ -17,7 +17,7 @@ if test -z "$1"; then
  exit 1
  fi
  -if ! sed --help | grep -q 'GNU'; then
  +if ! sed --help 2>&1 | grep -q 'GNU'; then
  echo "Error: the installed sed package is not compatible. Please make sure you have GNU sed installed in your system.";
  exit 1;
  fi
  