Changed usage line prefix. Show usage on syntax error.
Changed usage line prefix. Show usage on syntax error.

cedar-renjun/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,shangdawei/LibSWD,ongjohn/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD