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Exit with statuscode 0 for repo help init
The complete help text is printed, so the program executed successfully. Some tools (like OpenGrok) detects the availibility of a program by running it with a known set of options and check the return code. It is an easy and portable way of checking for the existence of a program instead of searching the path (and handle extensions) ourselves. Change-Id: Ic13428c77be4a36d599ccb8c86d893308818eae3
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