Server.setHook(_:to:at:in:)

Without an index this replaces every command bound to the name, leaving the one given at slot 0 — tmux assigns the array, not just an element. Pass at: to write one slot and leave its neighbours alone.

A name tmux does not know is a reply reporting why, not a thrown error.

• Parameters:
  • name: a hook name tmux knows, such as after-new-window.
  • command: the tmux command line to run, unparsed until tmux runs it.
  • index: which slot to write, or every slot when omitted.
  • scope: which table to write to.