There is a built-in file viewer for the console called "less", which is an enhanced version of the older Unix/Linux viewer "more" (which is also available). It is the same as the pager used for man, or the option --help.

with less, you can view a file one page at a time. Pressing space will move to the next page, and b wil back up a page. using a slash, /, will search (as in Vi), and n finds the next occurence.

There are more commands and options.

Oh, and to exit, you press q, which leaves the screen back to where it was previously, more or less.

Edit: In case it is not clear, to use less, you simply enter "less filename". And in case you didn't know, like almost every command, entering "less --help" gives a summary of usage.