Linux 用双引号括起来的双反斜杠替换正斜杠
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Replace forward slash with double backslash enclosed in double quotes
提问by wa4557
I'm desperately trying to replace a forward slash (/) with double backslash enclosed in double quotes ("\\")
我拼命地试图/用双引号 ( "\\") 中的双反斜杠替换正斜杠( )
but
但
a=`echo "$var" | sed 's/^\///' | sed 's/\//\"\\\"/g'`
does not work, and I have no idea why. It always replaces with just one backslash and not two
不起作用，我不知道为什么。它总是只替换一个反斜杠而不是两个
采纳答案by piokuc
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:
When/是正则表达式的一部分，您想用 的s（替代）命令替换它sed，您可以在命令的语法中使用其他字符而不是斜杠，因此您可以这样写，例如：
sed 's,/,\\,g'
above ,was used instead of the usual slash to delimit two parameters of the scommand: the regular expression describing part to be replaced and the string to be used as the replacement.
以上,用于代替通常的斜杠来分隔s命令的两个参数：描述要替换部分的正则表达式和要用作替换的字符串。
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.
以上将用两个反斜杠替换每个斜杠。反斜杠是一个特殊的（引用）字符，所以它必须被引用，这里它是用自己引用的，这就是为什么我们需要 4 个反斜杠来表示两个反斜杠。
$ echo /etc/passwd| sed 's,/,\\,g'
\etc\passwd
回答by gniourf_gniourf
How about this?
这个怎么样？
a=${var//\//\\}
Demo in a shell:
在 shell 中演示：
$ var=a/b/c
$ a=${var//\//\\}
$ echo "$a"
a\b\c
回答by jaypal singh
Another way of doing it: tr '/' '\'
另一种方法： tr '/' '\'
$ var=a/b/c
$ echo "$var"
a/b/c
$ tr '/' '\' <<< "$var"
a\b\c
