问题描述
我想通过命令行在HTML文件上运行查找并替换.
I would like to run a find and replace on an HTML file through the command line.
我的命令如下所示:
sed -e s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g index.html > index.html
当我运行它并随后查看文件时，它是空的.它删除了我文件的内容.
When I run this and look at the file afterward, it is empty. It deleted the contents of my file.
当我再次还原文件后运行此命令时:
When I run this after restoring the file again:
sed -e s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g index.html
stdout是文件的内容，并且已执行查找和替换.
The stdout is the contents of the file, and the find and replace has been executed.
为什么会这样?
推荐答案
当 shell 在命令行中看到> index.html时，它将打开文件index.html进行编写，清除之前的所有内容.
When the shell sees > index.html in the command line it opens the file index.html for writing, wiping off all its previous contents.
要解决此问题，您需要将-i选项传递给sed进行内联更改，并在对原文件进行更改之前创建原始文件的备份:
To fix this you need to pass the -i option to sed to make the changes inline and create a backup of the original file before it does the changes in-place:
sed -i.bak s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g index.html
没有.bak的命令在某些平台上将失败，例如Mac OSX.
Without the .bak the command will fail on some platforms, such as Mac OSX.
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