wezterm/docs/config/lua/pane/get_tty_name.md

pane:get_tty_name()

{{since('20230408-112425-69ae8472')}}

Returns the tty device name, or nil if the name is unavailable.

• This information is only available for local panes. Multiplexer panes do not report this information. Similarly, if you are using eg: ssh to connect to a remote host, you won't be able to access the name of the remote process that is running.
• This information is only available on unix systems. Windows systems do not have an equivalent concept.

This example sets the right status to show the tty name:

local wezterm = require 'wezterm'

wezterm.on('update-status', function(window, pane)
  local tty = pane:get_tty_name()
  if tty then
    window:set_right_status(tty)
  else
    window:set_right_status ''
  end
end)

return {}