在文件中的特定字符串后附加内容？

Question

我有这个文件：

# file.txt
My first name is Foo
and my last name is Bar.
I live in Baz.

我想补充一下：

My number is Baz.

后：

My first name is Foo
and my last name is Bar.

结果将是：

My first name is Foo
and my last name is Bar.
My number is Baz.
I live in Baz.

我怎么能在Ruby中做到这一点？

Answer 1

我确信有人可以发布一个更惯用的版本，但是

tmp=File.open('temp','w')
File.open(file, 'r') do |f|
   while line=f.gets
     tmp.write(line)
     tmp.write(value) if line == "value to match"
  end
end
tmp.close