Couldn't run the script on Ubuntu 12.04

Here is the information regarding my scenario

1) I can run adb from terminal
2) I have added pidcat.py on platform-tools
3) I have python running

But whenever I run pidcat.py from terminal,nothing happens. Am I doing anything wrong?
Lastly great tool

Start by reproducing the terminal invocation of pidcat.py on Ubuntu 12.04 with adb available and Python running. Read pidcat.py while tracing the no-output behavior; done means the script produces the expected filtered log output or the issue is narrowed to a documented environment limitation.

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