or is there a command from the command prompt?
You can also use 'cat', 'more'/'less' (depending on which is installed).
Cat is not very good for reading very long files as you wind up at the end, and may not be able to view it all depending on your setup.
More/less allow you to see a page at a time then continue to the next.
Also try 'mc' the Midnight Comander file manager. It allows you to view your files, read or edit them.