In addition to what toolic has advised, you can test if your file is readable and writeable using -r and -w. In its default mode Tie::File tries to open the file in read/write mode so the file needs to be both readable and writeable.

If you only want to read the file you would use tie like this:

use Tie::File;
use Fcntl 'O_RDONLY';
#...
tie (my @content, 'Tie::File', $file, mode => O_RDONLY) or die "Could 
+not open $file: $!";
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