windows 如何用sed用双引号将文件中的每一行括起来？
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How to enclose every line in a file in double quotes with sed?
提问by nw.
This is what I tried: sed -i 's/^.*/"$&"/' myFile.txt
这是我尝试过的： sed -i 's/^.*/"$&"/' myFile.txt
It put a $ at the beginning of every line.
它在每一行的开头放了一个 $。
回答by Karoly Horvath
here it is
这里是
sed 's/\(.*\)/""/g'
回答by jm666
shorter
较短
sed 's/.*/"&"/'
without spaces
没有空格
sed 's/ *\(.*\) *$/""/'
skip empty lines
跳过空行
sed '/^ *$/d;s/.*/"&"/'
回答by anubhava
You almost got it right. Try this slightly modified version:
你几乎猜对了。试试这个稍微修改的版本：
sed 's/^.*$/"&"/g' file.txt
回答by Julian de Bhal
You can also do it without a capture group:
您也可以在没有捕获组的情况下执行此操作：
sed 's/^\|$/"/g'
'^' matches the beginning of the line, and '$' matches the end of the line.
'^' 匹配行首，'$' 匹配行尾。
The |is an "Alternation", It just means "OR". It needs to be escaped here[1], so in english ^\|$means "the beginning or the end of the line".
这|是一个“交替”，它只是意味着“或”。这里需要转义[1]，所以在英文中的^\|$意思是“行的开头或结尾”。
"Replacing" these characters is fine, it just appends text to the beginning at the end, so we can substitute for ", and add the gon the end for a global search to match both at once.
“替换”这些字符很好，它只是将文本附加到末尾的开头，因此我们可以替换", 并g在末尾添加以进行全局搜索以同时匹配两者。
[1] Unfortunately, it turns out that | is not part of the POSIX "Basic Regular Expressions" but part of "enhanced" functionality that can be compiled in with the REG_ENHANCED flag, but is not by default on OSX, so you're safer with a proper basic capture group like s/^\(.*\)$/"\1"/
[1] 不幸的是，事实证明 | 不是 POSIX“基本正则表达式”的一部分，而是“增强”功能的一部分，可以用 REG_ENHANCED 标志编译，但在 OSX 上不是默认的，因此使用适当的基本捕获组更安全，例如s/^\(.*\)$/"\1"/
Humble pie for me today.
今天给我谦虚的馅饼。
