linux – 如果bash脚本的条件有什么问题

我安装了ZSH的Ubuntu 18.04.我有这个bash脚本来检查目录是否存在.

即使我有一个名为“〜/ .config”的目录,但条件总是为负.我似乎无法弄清楚我的代码有什么问题.

setup.sh

#!/bin/bash

if [ -d "~/.config" ] ; then
  echo "Directory exist"
else
  echo "Does not exist"
fi

使用chmod x ./setup.sh使文件可执行
输出始终不存在

解决方法:

由于您已编写“〜/ .config”,因此将其视为文字字符串.要允许~shell扩展,您需要不加引号：

#!/bin/bash
if [ -d ~/.config ] ; then
  echo "Directory exist"
else
  echo "Does not exist"
fi

Bash Pitfals, 26. echo “~”很好地解释了这一点：

26. echo “~”

Tilde expansion only applies when ‘~’ is unquoted. In this example echo writes ‘~’ to stdout, rather than the path of the user’s home directory.

Quoting path parameters that are expressed relative to a user’s home directory should be done using $HOME rather than ‘~’. For instance consider the situation where $HOME is “/home/my photos”.

06001