Via HN. Explainshell, a simple website to explain the parameters of the console program What a absolute fantastic helpful tool. One of those how come I never thought of that idea. Very useful when you're following a step-by-step tutorial and too lazy to search the meaning of each parameters through man page. Very useful if you need to learn console program with arcane command line arguments like iptables, GNU/Linux kernel firewall.

Sample example (shown below) of using iptables to set up Network Address Translation (NAT) . I used to cut and paste each description into one whole page to print out the full documentation to read it. Now is just too convenient with this tool.
iptables -t nat -A POSTROUTING -s 172.17.0.0/255.255.0.0 -o eth0 -j SNAT --to-source 212.170.21.172

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