“~/Desktop/test.txt:没有那个文件或目录" [英] "~/Desktop/test.txt: No such file or directory"

问题描述

我写了这个脚本:

#!/bin/bash

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

脚本不起作用；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

我做错了什么?

推荐答案

尝试将 ~ 替换为 $HOME.波浪号扩展仅在波浪号未加引号时发生.请参阅信息(bash)波浪号扩展".

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

您也可以在不引用它的情况下执行 file=~/Desktop，但是如果您将其中的一部分替换为带有字段分隔符的内容，那么它就会中断.无论如何，引用变量的值可能是养成习惯的一件好事.引用变量 file=~/"Desktop" 也可以，但我认为这很丑陋.

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.

在可能的情况下更喜欢 $HOME 的另一个原因:波浪号扩展只发生在单词的开头.所以 command --option=~/foo 仅在 command 本身进行波浪号扩展时才有效，这会因命令而异，而 command --option="$HOME/foo" 将始终有效.

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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