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In computer programming, a usage message or help message refers to a brief message displayed by a program that utilizes a command-line interface for execution. This message usually consists of the correct command line usage for the program and includes a list of the correct command-line arguments or options acceptable to said program. Usage messages are utilized as a quick way for a program to inform the user of proper command syntax, and should not be substituted for detailed documentation, such as a man page. ==Pattern== On Unix-like platforms, usage messages usually follow the same common pattern: * They often begin with "Usage:" , the command, followed by a list of arguments. * To indicate optional arguments, Square brackets are commonly used, and can also be used to group parameters that must be specified together. * Exclusive parameters can be indicated by separating them with vertical bars within groups. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Usage message」の詳細全文を読む スポンサード リンク
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