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If you want to see your top ten cpu using processes from the browser (e.g. you don't want to ssh into your server all the time for checking system load) you can run this command and browse to the machines ip on port 8888. For example 192.168.0.100:8888
-k, --keep-open will keep connection alive, and we could exclude using 'while true'
nc is such a powerful command, it could be used instead of any OS! :p
Here's how to serve a directory in one line of Ruby.
Handy for sharing files at a conference, for example.
Very simple web server listening on port 80 will serve index.html file or whatever file you like pointing your browser at http://your-IP-address/index.html for example.
If your web server is down for maintenance and you'd like to inform your visitors about it, quickly and easily, you just have to put into the index.html file the right HTML code and you are done! Of course you need to be root to run the command using port 80.