解惑 [[ ]] 中 ==、!= 以及 =~、!~ 的使用及其「怪异」行为

引用:

原帖由 apsnowolf 于 2008-10-30 16:21 发表
不好意思，是笔误：实际是这样：
>fname=file1.txt
>if [[ $fname='*.txt' ]];then echo yes;else echo no;fi
>yes
............................................................
>var="zhongguo"
> ...

引用:

Both problems may be solved by using a shell variable to hold the pattern.
Since word splitting is not performed when expanding shell variables in all
operands of the [[ command, this allows users to quote patterns as they wish
when assigning the variable, then expand the values to a single string that
may contain whitespace.