At certain times while using Gentoo you are going to have to perform a large emerge, for example when you do an update world. It can be challenging to keep track of the status of this emerge with all the output flying by on the screen. It can also become a problem if you want [...]

Watch runs a program at regular interval and continuously displays the output. This allows you keep track of the changes that are occurring in the program over time.
Run watch in the following way.

watch [options] command

By default watch updates the command output every 2 seconds. To change this interval us the ‘-n seconds‘ [...]