How to tail multiple files
Terminal command: tail -f <file.name> <file.name>

Tail Three Files

Tail Two Files
Tailing multiple files in one terminal window is a life saver when you are pressed for space on your screen.
With tail you can tail just about as many files as you want. I doubt it would be very useful to have more than a few tailed at the same time.

For a project that I am starting I wanted to use Rails and MySQL so I decided to install for source that I compile myself for both. It was amazingly easy and satisfying to have both compiled and installed on my machine for development. Hivelogic has some really simple easy to follow blog posts on how to do both. If you are wanting to compile and install either Rails or MySQL on your Mac from source code then I recommend you check them out.

Bike photo by piston9 / CC BY 2.0
What is key based authentication for ssh?
Key based authentication for SSH is a way to connect remotely to another computer/server using an encrypted file you HAVE and an optional password you KNOW to unlock the file. Key based authentication has the advantage of being more secure and/or more convenient.
Why?
Password based authentication:
Logging in via password over SSH encrypts your password so it ends up looking like this:
..t-:p.%.E.{..E..X7.@.@.~....s..............NXP...{W..!8..;.eh9..N......#....q..1f...:...D9R0 zy
Because the password is encrypted, it won’t be seen in plain text over the wire which is good. If the password is short or simple enough, a hacker will be able to crack your password. Assuming the password is good enough, password based authentication’s strength comes from keeping that knowledge from others.
Key based authentication allows you to connect remotely using an encrypted file as a key instead of a password. Key based authentication gives you the option to continue reading the rest of the article…

Ever wonder how to level sound volume on a recording or podcast? The Levelator is a super simple application for Mac or Windows to level out sound volumes on a podcast recording. Mike Farmer and I use it for our podcast over at http://technologyforlearning.info and it works wonders for the times when we accidentally move away from the microphone. It’s free and it works great so what are you waiting for? Go download it from their site at http://www.conversationsnetwork.org/levelator