Continous Monitoring of a Text File

Probably should have known this before now, but in any case: I found out that you can continuously monitor the output of a file using the "tail" command. In other words, if you use the command

tail -f <filename>

the program will output the last 10 lines of the file, and then it will continue output additional data as the file grows.  This is really handy, I found, when I needed to watch the output of genkernel.log while I was compiling my gentoo kernel.