diff --git a/build_platform.py b/build_platform.py
index b6b99f9d..50692bf4 100644
--- a/build_platform.py
+++ b/build_platform.py
@@ -168,6 +168,8 @@ def install_platform(platform):
         ColorPrint.print_fail("FAILED to install "+platform)
         exit(-1)
     ColorPrint.print_pass(CHECK)
+    # print installed core version
+    print(os.popen('arduino-cli core list | grep {}'.format(platform)).read(), end='')
 
 def run_or_die(cmd, error):
     print(cmd)
@@ -311,12 +313,12 @@ def test_examples_in_folder(folderpath):
 
         if BUILD_WARN:
             if os.path.exists(gen_file_name):
-                cmd = ['arduino-cli', 'compile', '--warnings', 'all', '--fqbn', fqbn, '-e', examplepath]
+                cmd = ['arduino-cli', 'compile', '--warnings', 'all', '--fqbn', fqbn, '-e', folderpath]
             else:
-                cmd = ['arduino-cli', 'compile', '--warnings', 'all', '--fqbn', fqbn, examplepath]
+                cmd = ['arduino-cli', 'compile', '--warnings', 'all', '--fqbn', fqbn, folderpath]
         else:
-            cmd = ['arduino-cli', 'compile', '--warnings', 'none', '--export-binaries', '--fqbn', fqbn, examplepath]
-        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+            cmd = ['arduino-cli', 'compile', '--warnings', 'none', '--export-binaries', '--fqbn', fqbn, folderpath]
+        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE)
         r = proc.wait(timeout=60)
         out = proc.stdout.read()