message: [scmd] Supported quit aliases: exit and q!.
diff: @@ -259,7 +259,7 @@ where
  let params: Vec<&str> = line.trim().split(' ').map(str::trim).collect();
  let cmd_name = params[0];
  match cmd_name {
  - "quit" => {
  + "quit" | "exit" | "q!" => {
  let global_opt = Arc::try_unwrap(global_opt)
  .ok()
  .expect("unwrap opt must success when quit.");
  