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R= @ruoru @chentaoyu
Unix 命令行参数标记语法
表达式
表达式 (Expression) 可以是
的任意组合。
表达式以空白字符（空格
\s，制表符\t或 换行符\n） 分割。符号
符号 (Symbol) 是一组被尖括号对 (
<和>) 包起来的字符串字面量，例如<username>或<phone_number>。通常而言，符号的名字描述了符号所指代内容。可选值
可选值 (Optional) 是一组被方括号对 (
[和]) 包起来的表达式，可选值代表了参数中可以被忽略的部分，例如对于[user]name[n]而言，username、usernamen、name和namen都是合法的值。枚举值
枚举值 (Enums) 是一组被花括号对 (
{和}) 包起来的字面量。枚举值包含了两个或以上可以被接受的值，用竖分隔符 (|) 分割。字面量
字面量 (Literal) 是命令行参数中既不是符号、也不是可选值或枚举值的字符序列。字面量可以是数字，如
100，或者是字符串，如abc。