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What's my (external public) IP address (command line)?

The Internet is running out of IP addresses (ipv4, but years after ipv6 came out we still haven't switched over to it). This is realer than Peak Oil. And so most of us are connected to the Internet with an IP address shared with many other people, with many devices seen by the outside world as having one address.

But more locally, behind a router or gateway or firewall, we all have unique addresses and names to identify each other by. But only locally.

And so each of our devices have two or more possible IP addresses. Each computer should have a local IP address, its main...

How to watch for file changes and trigger a shell command on any modification in OS X and Linux

These days our files are everywhere, you need an advanced IDE just to track where all the code for a small software project is, and you have many background processes running as dependencies on your main application. It's not always possible to know when a particular file will be updated since it's done via a chain of automatic processes. Have you ever been waiting for a process to run and not notice that it had finished? As developers, we need ways to hook into these chains and be aware of files which change when they change in order to trigger new actions off of those "filesystem events...

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