on *:join:#: {
  if ( %joinmsg. [ $+ [ $chan ] ] ) {
    notice $nick %joinmsg. [ $+ [ $chan ] ]
  }
}
on *:TEXT:!joinmsg *:#: { 
  if ($nick isop $chan) { 
    set %joinmsg. [ $+ [ $chan ] ]  [ $2- ] 
    notice $nick Welcome message for channel $ has been changed too : $2-  , on join of a user it will show the message
  }
  else notice $nick Sorry only Op's are aloud to set welcome greet Thank you.
}