Someone

on *:text:!unban:#: {
  if ($nick isop $chan) { /mode $chan -b $$2 | /msg $chan $$2 has been unbanned! }
}
on *:text:!ban:#: {
  if ($nick isop $chan) { /mode $chan +b $$2 | /msg $chan $$2 has been banned! }
}