I know PHP isn't very popular here, but it's awesome for string manipulation, parsing files.

One-line that reads the file, splits multiple lines into an array:

    <?php 
        $l = explode("\n", file_get_contents("in.txt"));

Want to sort them alphabetically? Add

    sort($l);

Trim them?

    $trimmed = array_map(trim, $l);

Remove duplicates?

    $unique = array_unique($trimmed);