bash 使用 sed 替换花括号
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Using sed to replace curly braces
提问by barefly
I am parsing some json data and I am in need of removing both beginning and ending curly braces, {}. I am using sed to perform this operation, but from what I can tell curly braces perform special functionality in sed and escaping them doesn't seem to be working. Here are a couple examples of what I have tried. I really could use a working regular expression. Thanks in advance!
我正在解析一些 json 数据，我需要删除开头和结尾的大括号 {}。我正在使用 sed 来执行此操作，但据我所知，花括号在 sed 中执行特殊功能并且转义它们似乎不起作用。以下是我尝试过的几个例子。我真的可以使用一个有效的正则表达式。提前致谢！
First thing I tried that doesn't work.
我尝试的第一件事不起作用。
sed 's/\{\}//g'
Some redone code from an answer I found here.
我在这里找到的答案中的一些重做代码。
sed 's/\(\{\|\}\)//g'
回答by hek2mgl
I would use trfor that:
我会用tr：
tr -d '{}' < file.json
With sedit should be:
有了sed它应该是：
sed 's/[{}]//g' file.json
[{}]is a character class that means {or }.
[{}]是一个字符类，表示{或}。
If you want to change the file in place pass the -ioption to sedor use the spongetool from moreutils. I like it because it is generic, meaning it will work with any command regardless if it supports in place editing or not:
如果你想改变的地方文件传递-i选项sed或使用sponge从工具moreutils。我喜欢它，因为它是通用的，这意味着它可以与任何命令一起使用，无论它是否支持就地编辑：
sed 's/[{}]//g' file.json | sponge file.json
