You need to open the file $filename before you can read it. I suspect you wanted to do somethings like ... 
open( MYFILE, "<$filename") or die ...
...
while ( my $line = <MYFILE> ) { 
...

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In reply to Re: help with error 'readline() on unopened filehandle' by Plankton
in thread help with error 'readline() on unopened filehandle' by bhargavkanakiya

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