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open FILE1,"1.txt" or die "can't open file 1";
open FILE2,"2.txt" or die "can't open file 2";
...
close FILE2;
close w1;
close w2;

file 1 (1.txt) 
aqw dfr 34 
poilo ggg 98 
file 2  (2.txt)
qww asd 28 
poilo ggg 97

3.txt 
aqw dfr 34
4.txt 
qww asd 28