Hi monks!

I expected the following code to read line by line file 1.dat and 2.dat and compare each line of file 1.dat with each line of file 2.dat. 

open A, '1.dat' or die $!;
open B, '2.dat' or die $!;
while (my $lineA=<A>){
    while(my $lineB=<B>){
    print $lineA,' ', $lineB;
    }
}

[download]
Apparently there is something in the behavior of filehandles that I don't understand as the condition in the first while loop does not evaluate true a second time.

example files

1.dat
----
1
2
3

2.dat
----
a
b
c

[download]
thank you for any sugestions

In reply to read from two files with nested while loops by diamantis

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