Using an application of terminal command and you're not sure if it's stuck? Want to monitor network usage from the computers on your network? There's a built-in program for that.
As a big fan of Sublime Text 2, I was excited to find out that somebody made a port of the Monokai theme for macOS and OSX's Terminal.
Flushing your dns is a very useful troubleshooting step and is necessary for some network changes to take effect.
I hooked up my external monitor today and found that its desktop background had been replacement by a grey image.