If the file is little (a few megabytes, but ymmv), just read it into an array, and split the lines as needed. If it's too large for that, try Tie::File, and if it's humongous, it's time for a database. In any of these cases, you can go directly (this is why I prefer the term "direct access" to "random access") to a specific line.

That is, of course, if I'm interpreting your posting correctly: go to line #n and read a specific value.