Run a Typescript
Often something you do (like a large build) will generate copious amounts of screen output, and scrollback buffers are only so large. For this problem, Unix has a tool known as the typescript. If you run the command script, it will start a new shell for you, and all output from this shell will not only go to your screen, but also to a file called typescript. Once you're done, log out of the shell and then peruse or transmit your typescript at your leisure.
This is especially useful for large builds where lots of configuration info goes flying past!