限于每个输入行一部分的字符替换 [英] Substitution of characters limited to part of each input line

问题描述

有一个文件，例如. Inventory.conf中包含以下行:

Have a file eg. Inventory.conf with lines like:

Int/domain—home.dir=/etc/int

我需要在=之前而不是之后替换/和—. 结果应该是:

I need to replace / and — before the = but not after. Result should be:

Int_domain_home_dir=/etc/int

我尝试了几个sed命令，但似乎都不符合我的需求.

I have tried several sed commands but none seem to fit my need.

推荐答案

带有t循环(BRE)的Sed:

Sed with a t loop (BRE):

$ sed ':a;s/[-/—.]\(.*=\)/_\1/;ta;' <<< "Int/domain—home.dir=/etc/int"
Int_domain_home_dir=/etc/int

当找到-/—.字符之一时，将其替换为_.捕获直至=的后续文本，并使用反向引用输出.如果先前的替换成功，则t命令循环以标记:a以检查是否有进一步的替换.

When one of the -/—. character is found, it's replaced with a _. Following text up to = is captured and output using backreference. If the previous substitution succeeds, the t command loops to label :a to check for further replacements.

如果您使用的是BSD/Mac OSX(感谢@ mklement0):

If you're under BSD/Mac OSX (thanks @mklement0):

sed -e ':a' -e 's/[-/—.]\(.*=\)/_\1/;ta'

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