refine --help result (#151)
* add a OB_FAIL for ret check * refine --help result
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@ -58,6 +58,7 @@ static void print_help()
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{
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MPRINT("observer [OPTIONS]");
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MPRINT(" -h,--help print this help");
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MPRINT(" -v,--version print the information of version");
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MPRINT(" -z,--zone ZONE zone");
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MPRINT(" -p,--mysql_port PORT mysql port");
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MPRINT(" -P,--rpc_port PORT rpc port");
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