＆QUOT;〜/桌面/的test.txt：没有这样的文件或目录＆QUOT; [英] "~/Desktop/test.txt: No such file or directory"

问题描述

我已经写了这个剧本：

#!/bin/bash

file="~/Desktop/test.txt"
echo "TESTING" > $file

该脚本不工作;它给了我这个错误：

The script doesn't work; it gives me this error:

./tester.sh: line 4: ~/Desktop/test.txt: No such file or directory

我在做什么错了？

What am I doing wrong?

推荐答案

试着用替换〜 $ HOME 。波浪线扩展，只有当波浪线是带引号的发生。参见信息（bash）的波浪线扩展。

Try replacing ~ with $HOME. Tilde expansion only happens when the tilde is unquoted. See info "(bash) Tilde Expansion".

您也可以做文件=〜/桌面没有引用它，但如果你的东西，在这一个字段分隔符替换其中的一部分，那么它会打破。引用变量的值可能是一个好东西进入反正习惯。引用变量文件=〜/桌面也将工作，但我认为这是相当丑陋。

You could also do file=~/Desktop without quoting it, but if you ever replace part of this with something with a field separator in it, then it will break. Quoting the values of variables is probably a good thing to get into the habit of anyway. Quoting variable file=~/"Desktop" will also work but I think that is rather ugly.

另一个原因是preFER $ HOME ，在可能的情况：波浪线扩展只发生在文字的开端。因此，命令--option =〜/富只会工作，如果命令做波浪线扩展本身，这将是命令而异，而命令--option =$ HOME /富永远是可行的。

Another reason to prefer $HOME, when possible: tilde expansion only happens at the beginnings of words. So command --option=~/foo will only work if command does tilde expansion itself, which will vary by command, while command --option="$HOME/foo" will always work.

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