How to get the previous line in a file?

[Qilong Ren]

Hi,all

I am new to this list. And I am glade I am here.
I have a question. I need to do some text processing. I need to read from a file line by line. If some line is met with some condition, the previous line needs some modification. How to get the info of the previous line? 

Thanks!
Qilong




 
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