Re^2: How to loop over two lines, alter a value in the current line and save it to the previous line?

Hi, thanks for your very quick answer. Yes, I would like my modifications reflected in $previous_line in the next iteration of the loop, so your suggestion makes a lot of sense. Unfortunately that change seems to make $previous_line always equal the first line of the file for some reason

Comment on Re^2: How to loop over two lines, alter a value in the current line and save it to the previous line?

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Re^3: How to loop over two lines, alter a value in the current line and save it to the previous line? by hdb (Monsignor) on Jan 07, 2016 at 11:39 UTC
Correct, but it is not used anymore at all within the loop.	[reply]
Re^4: How to loop over two lines, alter a value in the current line and save it to the previous line? by rjc33 (Sexton) on Jan 07, 2016 at 11:51 UTC
I'm afraid I don't understand, by $previous_line always being the first line it affects all of the variables in the loop. The loop starts on line 2, with the previous line being line 1; in the next iteration I'd like it to be on line 3, with the previous line being line 2 (and so on).	[reply]
Re^5: How to loop over two lines, alter a value in the current line and save it to the previous line? by hdb (Monsignor) on Jan 07, 2016 at 11:59 UTC
Why do you need `$previous_line` if you already have `@previous_columns`?	[reply] [d/l] [select]
Re^6: How to loop over two lines, alter a value in the current line and save it to the previous line? by rjc33 (Sexton) on Jan 07, 2016 at 12:09 UTC