on *:TEXT:!count*:#:{ 
  if ($2- = $null) msg $chan 15 Current people on 4 $chan 15 is 4 $nick($chan,0) 
  if ($me !ison $2-) { /join $2- | msg $chan 15 Current people on 4 $2 15 is $nick($2,0) | /part $2- } 
  if ($me ison $2-) msg $chan 15 Current people on 4 $2 15 is 4 $nick($2,0) 
}