Gerald Combs created Ethereal, the ancestor of Wireshark, back in 2006. When he went to work in a new job, he could not use the name Ethereal any more so he renamed his tool Wireshark. The rest is history!
This tutorial will present you tshark, the command-line version of Wireshark, which is a very popular and capable network protocol analyser. The main advantage of tshark is that it can be used in scripts. Its main disadvantage is that it does not have a GUI.