This snippet allows you to change your nick in all networks that you have open.

After loading it, all you have to do is type /gnick [newnick] (without the brackets)

alias gnick {
  if ($1 == $null) { echo -a You need to provide a nickname to change to. }
  else {
    set -e %totalnets $scon(0)
    while (%totalnets > 0) {
      scon %totalnets nick $1
      dec %totalnets
    }
  }
}