Someone

on *:text:!blacklist*:#:{ 
  if ($address($nick,2) == $address($me,2)) { 
    writeini black.ini BL $address($2,1) bl 
    ban -k $chan $2 you are Blacklisted from $chan $+ . 
    notice $nick $2 is now blacklisted from $chan $+ . 
  } 
} 
on *:text:!unblacklist*:#:{ 
  if ($address($nick,2) == $address($me,2)) { 
    remini black.ini BL $address($2,1) 
    mode $chan -b $address($2,1) 
    notice $nick $2 is now unblacklisted from $chan $+ . 
  } 
} 
on *:join:#:{ 
  if ($readini(black.ini,BL,$address($nick,1))) ban -k $chan $nick you are Blacklisted from $chan $+ .