问题描述
我极力尝试用双引号("\\")内的双反斜杠替换正斜杠(/)
I'm desperately trying to replace a forward slash (/) with double backslash enclosed in double quotes ("\\")
但是
a=`echo "$var" | sed 's/^\///' | sed 's/\//\"\\\\\"/g'`
不起作用，我也不知道为什么.它总是只替换一个反斜杠，而不是两个
does not work, and I have no idea why. It always replaces with just one backslash and not two
推荐答案
当/是要用sed的s(替代)命令替换的正则表达式的一部分时，可以使用命令语法中使用其他字符而不是斜杠，因此您可以编写例如:
When / is part of a regular expression that you want to replace with the s (substitute) command of sed, you can use an other character instead of slash in the command's syntax, so you write, for example:
sed 's,/,\\\\,g'
在,上方使用
而不是通常的斜杠来分隔s命令的两个参数:描述要替换部分的正则表达式和用作替换的字符串.
above , was used instead of the usual slash to delimit two parameters of the s command: the regular expression describing part to be replaced and the string to be used as the replacement.
以上将用两个反斜杠替换每个斜杠.反斜杠是一个特殊的(引号)字符，因此必须加引号，在这里用引号引起来，这就是为什么我们需要4个反斜杠来表示两个反斜杠的原因.
The above will replace every slash with two backslashes. A backslash is a special (quoting) character, so it must be quoted, here it's quoted with itself, that's why we need 4 backslashes to represent two backslashes.
$ echo /etc/passwd| sed 's,/,\\\\,g'
\\etc\\passwd
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