Mine

alias amsg {
  var %i 1
  ; Comma seperated channels to not advertise in
  var %noamsg_chans #w4r
  while (%i <= $chan(0)) {
    var %c 1
    while (%c <= $numtok(%noamsg_chans,44)) {
      if ( $chan(%i) == $gettok(%noamsg_chans,%c,44) ) { inc %i | continue }
      inc %c
    }
    if (%i <= $chan(0)) {
      msg $chan(%i) $1-
      inc %i
    }
  }
}