在文件中找到单词的索引并用 bash 替换以前的字符

Question

I got a text file. It contains multiple lines, some of the has following line:

[some random text till] this point , good to go

I need to replace [some random text] with now from

Implementation steps:

1 Find index for the phrase "this point" (mandatory, need combination of two words verify this is the right line)

2.Replace all previous characters with "now from" string

3.New line should be "now from this point , good to go"

Answer 1

这个正在做这项工作

sed -i -e 's|${const_prrefix}.*this:'now from'|g' ${source_file}