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If you don't want to read in the file, then you can use  or in your original code above. You'll need an if statement to catch when either of the two $lineX values is undefined, and make the comparison otherwise. The code can increase in complexity as you decide whether you want to see if things are offset in a file, rather than if the same lines have the same values.

Bioinformatics

In reply to Re: Reading concurrently two files with different number of lines by bioinformatics
in thread Reading concurrently two files with different number of lines by frogsausage

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