in reply to read file from ARGV
hope the below code will b helpful for you
open (FH,'<',$ARGV); #or @ARGV
I think it would be a good practice to check the return of open function and to also close an opened filehandles like
open my $fh,'<',$ARGV or die "can't open file: $!";
close $fh or die "can't close file: $!";
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