何时
当command line(?指每一行command?)被分割成tokens后,执行shell展开
种类
注:
展开执行的顺序如上。
展开之后
展开完成后,所有在原来的word中的quote字符被移除,除非它本身被quoted。这个过程称为引用去除。
待完善
(?这段话不知道怎么理解?)
Only brace expansion, word splitting, and filename expansion can change the number
of words of the expansion; other expansions expand a single word to a single word. The
only exceptions to this are the expansions of "$@" and "${name[@]}".
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