In [1]: from pumphouse import checks

In [2]: p = checks.PumpHouseShellCheck({"input": ["127.0.0.1", "127.0.0.2", "10.0.0.3", "10.0.0.4" ], "env": {"COUNT": 1}, "cmd": "ping -c\${COUNT} ^" });

In [3]: print p.run()
['10.0.0.4', '10.0.0.3']