问题描述
我试图在来自 bash 脚本的文件特定行的最后一个字符处附加一个变量.
I am trying to append a variable at the last character of a specific line of a file from a bash script.
该文件名为 myfile.txt，我想要做的是将名为 VERSION 的变量的内容附加到该行的最后一个字符之后包含唯一字符串 MYVERSION 的文件.
The file is called myfile.txt and what I want to do is to append the contents of a variable named VERSION right after the last character of the line of the file that contains the unique string MYVERSION.
也就是说，如果在这一行中有以下内容:
That is, if in this line there is the following:
MYVERSION=0.1
和 VERSION="-custom_P1" 那么，我想要以下内容:
and VERSION="-custom_P1" then, I want to have the following:
MYVERSION=0.1-custom_P1
谢谢大家的帮助.
推荐答案
试试这个:
sed -i "/^MYVERSION=/ s/\$/$VERSION/" myfile.txt
这个想法是找到以 MYVERSION= 开头的行，然后用 $VERSION 环境变量的内容替换该行的结尾.
The idea is that it finds a line that starts with MYVERSION= and then replaces the end of that line with the contents of the $VERSION environment variable.
最初我不确定第一个 $ 是否需要转义，但@sehe 的评论和它的支持者让我相信它确实如此.
originally I wasn't sure if the first $ needed to be escaped, but @sehe's comment and its upvoters convinced me that it does.
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