Using Commandlib

How to:

• Add directory to PATH (with_path)
• Capture output (.output())
• Easily invoke commands from one directory (CommandPath)
• Change your command's environment variables (with_env)
• Run command and don't raise exception on nonzero exit code (ignore_errors())
• Piping data in from string or file (.piped)
• Piping data out to string or file (.piped)
• Run commmands interactively using icommandlib or pexpect
• Easily invoke commands from the current virtualenv (python_bin)