02_create_ckdtree.sh: Update.

quickstart/02_create_ckdtree.sh

@@ -10,7 +10,7 @@ source_dir=`cat source_dir.txt`
 
 grid_dir="${HOME}/pyicon_data/grids/r2b4_oce_r0004"
 if [ ! -d ${grid_dir} ]; then
-  mkdir ${grid_dir}
+  mkdir -p ${grid_dir}
 fi
 
 echo "rsync -av ${source_dir}/swift.dkrz.de/example_data_r2b4/icon_grid_0036_R02B04_O ${grid_dir}"