You need to remove the line ending when you read it in.

chomp(my @myarray=`cat $myfile`);
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The above has problems:

• It's unduly slow since it has to launch two processes.
• The content of $myfile is subject to shell interpretation.
• It's harder to check for errors.
• It's not portable.

Using Perl's functions and operators would eliminate all of those problems.

open(my $fh, '<', $filename)
   or die("Unable to open ...: $!\n");

chomp(my @myarray = <$fh>);
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If you only need a line at a time, you can use while (<>).

open(my $fh, '<', $filename)
   or die("Unable to open ...: $!\n");

while (<$fh>) {
   chomp;
   ...
}
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