Linux 带有特殊字符的 sed
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sed with special characters
提问by shd
I have this line that I want to use sed on:
我有这条线，我想在上面使用 sed：
--> ASD = $start ( *.cpp ) <--
where $start is not a varaiable, I want to use sed on it and replace all this line with:
$start 不是变量，我想在它上面使用 sed 并将所有这一行替换为：
ASD = $dsadad ( .cpp )
How can I make sed ignore special charactars, I tried adding back slash before special characters, but maybe I got it wrong, can some one show me an example?
如何让 sed 忽略特殊字符，我尝试在特殊字符前添加反斜杠，但也许我弄错了，有人可以给我举个例子吗？
Here is what i want :
这是我想要的：
sed 's/CPPS = $(shell ls | grep \*\.cpp )/somereplace/' Makefile
采纳答案by Cédric Julien
sed 's/$start/$dsadad/g' your_file
>> ASD = $dsadad ( *.cpp )
sed 's/\*//g' your_file
>> ASD = $start ( .cpp )
To follow your edit :
要遵循您的编辑：
sed -i 's/ASD = $start ( \*.cpp )/ASD = $dsadad ( .cpp )/' somefile
>> ASD = $dsadad ( .cpp )
Add the -i (--inplace) to edit the input file.
添加 -i (--inplace) 以编辑输入文件。
回答by sapht
Backslash works fine. echo '*.cpp' | sed 's/\*//'=> .cpp
反斜杠工作正常。echo '*.cpp' | sed 's/\*//'=>.cpp
If you're in a shell, you might need to double escape $, since it's a special character both for the shell (variable expansion) and for sed (end of line)
如果您在 shell 中，则可能需要双重 escape $，因为它是 shell（变量扩展）和 sed（行尾）的特殊字符
echo '$.cpp' | sed "s/\\$//"or echo '$.cpp' | sed 's/\$//'=> '.cpp'
echo '$.cpp' | sed "s/\\$//"或echo '$.cpp' | sed 's/\$//'=> '.cpp'
Do not escape (or ); that will actually make them them special (groups) in sed. Some other common characters include []\.?
不要逃避(或); 这实际上会使他们在 sed 中变得特别（组）。其他一些常见字符包括[]\.?
This is how to escape your example:
这是逃避您的示例的方法：
sed 's/ASD = $start ( \*\.cpp )/ASD = $dsadad ( .cpp )/' somefile
回答by glenn Hymanman
The chacters $,*,.are special for regular expressions, so they need to be escaped to be taken literally.
该chacters $，*，.是特殊的正则表达式，所以他们需要逃到字面上理解。
sed 's/ASD = $start ( \*\.cpp )/ASD = $dsadad ( .cpp )/' somefile
