Everybody has his own pet for this, but I'll go for this solution: 
print file "'$var1'=='$var2'\n";

[download]
So that you know where your extra \n character is. I guess that if you see the expression on two lines, it should be in $var1, but you should try and see where the expression is broken.

In any case, you'd better be aware that when you read a text file, you also read its embedded \n's, so you'd better chomp the lines before processing them.

In reply to Re: output to a single line by l3nz
in thread output to a single line by Eva

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