If you mean reading from files on a Unix filesystem you could try the following. It's a crude method but worked flawlessly for me in the past.
1. Use an SSL client like PuTTy to connect to your unix server. You can automate configuration and initiation of the session via PuTTy using QTP.
2. The new window that opens up will be identified by QTP, the text within it will not be identified as an object or a static text.
3. Use a window scrapping technique, using the prompt as a new line identifier and various QTP text editing methods (Len, Trim, Right, etc) to grab the text displayed.
4. Based on text observed, pass keyboard input to pass the commands you need to generate the file/display. Read your output, copy to clipboard and then to a notepad utility.
Output to a file and ftp file to your local machine and read using notepad.
* The copy to clipboard will most likely require you to write a function that right clicks on the unix session window, scroll down the menu to the item that mentions 'copy to clipboard'.
This isn't exactly the prettiest method but it works. It's not exactly interactive but if you have the patience you will be able to make it work for what you want.