具有多个条件的if语句 [英] An if statement with multiple conditions

问题描述

由于我对Bash缺乏知识，所以我遇到了一个小问题.我有41个文件夹的应用程序"目录.在每个文件夹中，都有一个css子目录，其中包含胶水1.css文件.我的目标是通过bash循环删除该css文件，但我需要免除两个文件夹:ad和glue-resources.

Due to my lack of knowledge in Bash, I come to you with a trivial problem. I have an 'Apps' directory of 41 folders. In each folder, there is a css subdirectory containing a glue1.css file. My goal is to remove that css file via a bash loop, but I need to exempt two folders: ad and glue-resources.

我需要免除ad文件夹，因为没有css文件.我想防止执行时发生以下错误:

I need to exempt the ad folder because there is no css file. I want to prevent the following error from occurring upon execution:

rm: ad/css/glue1.css: No such file or directory

考虑以下假设目录(为简洁起见，缺少41个文件夹):

Consider this hypothetical directory (lacking 41 folders for brevity):

Apps
  ad
    css
      (empty)
  glue-resources
    css
      glue1.css (keep this file!)
  profile
    css
      glue1.css (remove this file!)
  ...

这是我到目前为止的代码.如果父目录路径不等于glue-resources/css/或ad/css/，则应在胶1.css文件上调用rm.

Here is the code I have so far. It should call rm on the glue1.css file if the parent directory path is NOT equal to glue-resources/css/ or ad/css/.

for dir in **/css/; do
if [[ "${dir}" != 'glue-resources/css/' || "${dir}" != 'ad/css/' ]]; then
    rm "${dir}"glue1.css
fi
done

以上代码结果不起作用.我收到同样的没有这样的文件或目录"错误，并且已删除glue-resources/css中的gum1.css文件.我不太确定为什么它不起作用-我在某处读到，如果您使用[[和]]，则可以组合多个条件.

The above code results doesn't work. I get the same 'No such file or directory' error and the glue1.css file in glue-resources/css has been removed. I'm not quite sure why it doesn't work—I read somewhere that if you use [[ and ]] you can combine multiple conditions.

我认为问题在于我不了解bash中的多个条件如何工作.以下版本的代码有效.

I think the problem is that I don't understand how multiple conditions in bash work. The following versions of the code work.

for dir in **/css/; do
if [[ "${dir}" != 'glue-resources/css/' ]]; then
    rm "${dir}"glue1.css
fi
done


for dir in **/css/; do
if [[ "${dir}" != 'ad/css/' ]]; then
    rm "${dir}"glue1.css
fi
done

我尝试向if语句添加多个条件失败.

My attempt to add multiple conditions to the if statement failed.

推荐答案

由于||表示逻辑或，因此以下条件将始终返回true:

Because || represents logical-OR, the following condition will always return true:

[[ "${dir}" != 'glue-resources/css/' || "${dir}" != 'ad/css/' ]]

我怀疑您想要的是:

[[ "${dir}" != 'glue-resources/css/' && "${dir}" != 'ad/css/' ]]

&&是逻辑与.它要求同时满足两个条件.

&& is logical-AND. It requires that both conditions be met at the same time.

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