IRC ghost - how do I unghost and get back my original nick?

Solution 1:

You "ghost" a nick you own once you are identified as the same account as that nick with the following:

/msg nickserv ghost nickname

This will "ghost" (kill) your original nickname, which frees up that nick so you can do

/nick nickname

to change your nick again.

(In some networks (e.g. Freenode), you can use /msg nickserv regain nickname which does both actions at once.)