替换所有出现的“."使用sed在'='之前加上'_' [英] Replace all Occurences of '.' with '_' before '=' using sed

问题描述

我有一个如下的属性文件:

I have a properties file as below:

build.number=153013
db.create.tablespace=0
db.create.user=0
db.create.schema=0
upgrade.install=1
new.install=0
configure.jboss=0
configure.jbosseap=false
configure.weblogic=1
configure.websphere=0

我需要将这些变量导入到Shell脚本中.如你所知， '.'不是在Linux中用作变量的有效字符.我将如何使用sed替换所有出现的."在'='和'_'之前.我已替换所有出现的."但是有些属性的值包含一个."我不想修改.

I need to import these variables into a shell script. As you know, '.' is not a valid character to use as a variable in linux. How would I use sed to replace all occurrences of '.' before the '=' with '_' . I have replaced all occurrences of '.' but there are some properties that have values which contain a '.' that I would like to not modify.

感谢您的帮助！

谢谢！

推荐答案

您可以使用

sed -e ':b; s/^\([^=]*\)*\./\1_/; tb;'

只要匹配成功，它就会将 stringWithoutEquals _ 替换为 stringWithoutEquals _ .实际上，这会将所有.之前的所有.替换为 _ .

It replaces stringWithoutEquals. with stringWithoutEquals_ for as long as the match succeeds. In effect, this replaces all the .'s before the = with _.

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