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MYFILE.TXT包含如何在文本文件中插入一行?
This is a sample file
This contains some data
End of file
我将创建内容的字符串(动态地)并且写入文件内的阵列
我试图与R +模式,但它会覆盖现有的内容
file = File.open('myFile.txt','r+')
myString = 'Dynamic content' # varies accordingly for each file based on file
while (line = @file.gets)
next unless line =~ /sample file/
@file.puts(myString)
break
end
但它导致myFile.txt包含
This is a sample file
Dynamic content
e data
End of file
我有一个+模式尝试使用和追加模式增加了最后的文件追加到最后
我试图让MYFILE.TXT作为
This is a sample file
Dynamic content
This contains some data
End of file
是否有任何其他方式/在红宝石模式做到这一点?
如果内存服务,在遥远的过去文件中的一段时间是纸张(磁带或卡)。 –
@CarySwoveland:哦是的,我见过工厂机器从[像这样的代码]工作(https://upload.wikimedia.org/wikipedia/commons/8/8d/%D0%9F%D0%B5%D1% 80%D1%84%D0%BE%D0%BA%D0%B0%D1%80%D1%82%D0%B0.jpg)。 –