如果文件夹不存在，如何使用 Bash 创建文件夹? [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;

这似乎不起作用.有人可以帮忙吗?

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

推荐答案

首先，在 bash 中["只是一个命令，它需要字符串]"作为最后一个参数，所以右括号前的空格(以及在！"和-d"之间，这也需要是两个单独的参数)很重要:

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 ]; then
  mkdir -p /home/mlzboy/b2c2/shared/db;
fi

其次，由于您使用 -p 切换到 mkdir，此检查是无用的，因为这是首先要做的.随便写:

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;

就是这样.

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