如何运用Bash创建一个文件夹，如果它不存在？ [英] How to use Bash to create a folder if it doesn't already exist?

问题描述

#!/bin/bash
if [!-d /home/mlzboy/b2c2/shared/db]; then
    mkdir -p /home/mlzboy/b2c2/shared/db;
fi;

这似乎并没有工作。谁能帮助？

This doesn't seem to work. Can anyone help?

推荐答案

首先，在bash[只是一个命令，它预计字符串]作为最后一个参数，所以右括号前的空白（以及！作为与-d，这需要两个单独的论点太）之间，是重要的：

First, in bash "[" is just a command, which expects string "]" as a last argument, so the whitespace before the closing bracket (as well as between "!" and "-d" which need to be two separate arguments too) is important:

if [ ! -d /home/mlzboy/b2c2/shared/db ]; ...

其次，由于您使用-p开关设置为的mkdir ，这个检查是没用的，因为这是摆在首位什么呢。只要写：

Second, since you are using -p switch to mkdir, this check is useless, because this is what does in the first place. Just write:

mkdir -p /home/mlzboy/b2c2/shared/db;

和多数民众赞成它。

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