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I Hsin Cheng
83f9f18776
Originally, some of the commands' usage display didn't achieved to show newline, while some of them does, which are more user-friendly, and won't confuse the message if there're more which should be in the nextline. Fix this issue by returning usage string with a newline. Signed-off-by: I Hsin Cheng <richard120310@gmail.com>