The multitail command can be very helpful whenever you want to watch activity on a number of files at the same time – especially log files. It works like a multi-windowed tail -f command. That is, it displays the bottoms of files and new lines as they are being added. While easy to use in general, multitail does provide some command-line and interactive options that you should be aware of before you start to use it routinely.
The simplest use of multitail is to list the names of the files that you wish to watch on the command line. This command splits the screen horizontally (i.e., top and bottom), displaying the bottom of each of the files along with updates.
Thanks to Sandra Henry-Stocker (see source)