bash 如何在bash中做复杂的条件？('and' &&, 'or' || ...)
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时间：2020-09-18 02:07:06 来源:igfitidea点击:
How to do complex conditionals in bash? (mix of 'and' &&, 'or' || ...)
提问by Suan
How do I accomplish something like the following in bash?
如何在 bash 中完成类似以下的操作？
if ("$a" == "something" || ($n == 2 && "$b" == "something_else")); then
...
fi
回答by Niklas B.
You almost got it:
你几乎明白了：
if [[ "$a" == "something" || ($n == 2 && "$b" == "something_else") ]]; then
In fact, the parentheses can be left out because of operator precedence, so it might also be written as
事实上，括号可以因为运算符优先级而被省略，所以它也可以写成
if [[ "$a" == "something" || $n == 2 && "$b" == "something_else" ]]; then
回答by Suan
if [[ "$a" == "something" ]] || [[ $n == 2 && "$b" == "something_else" ]]; then
...
fi
