Помощь в написании красивого скрипта

wpctl status | awk '/├─ Sinks:/,/├─ Sink endpoints:/ {if ($0 ~ /[[:space:]]│[[:space:]]+\*[[:space:]]+/) {
 name_start = index($0, ".")+2;
 name_end = index($0, "[vol:");
 print substr($0, name_start, name_end - name_start);
 exit
}}'

$ cat audio.txt 
Audio
 ├─ Devices:
 │      40. HDA NVidia                          [alsa]
 │      41. Webcam C310                         [alsa]
 │      42. Jabra EVOLVE 20 MS                  [alsa]
 │      43. Starship/Matisse HD Audio Controller [alsa]
 │  
 ├─ Sinks:
 │      50. Jabra EVOLVE 20 MS Аналоговый стерео [vol: 0.80]
 │  *   52. Starship/Matisse HD Audio Controller Цифровой стерео (IEC958) [vol: 1.00]
 │  
 ├─ Sink endpoints:
 │  
 ├─ Sources:
 │  *   51. Jabra EVOLVE 20 MS Моно         [vol: 0.76]
 │  
 ├─ Source endpoints:
 │  
 └─ Streams:

$ sed -n '/├─ Sinks:/,/├─ Sink/p' audio.txt | awk '/ │  /{if ($2=="*"){gsub(/\./, "", $3);print "Current is: "$3" "$4}else{gsub(/\./, "", $2);print $2" "$3}}'
50 Jabra
Current is: 52 Starship/Matisse

parse_sinks=n
for line in "${lines[@]}"; do
  if [[ $parse_sinks == y ]]; then
    # Сделай со мной что-то
    echo "$line"; 
  elif [[ $line == *"Sinks:"* ]]; then 
    parse_sinks=y;
  elif [[ $line == *"Sink endpoints:"* ]] then 
    parse_sinks=n
  fi
done

#!/usr/bin/wpexec

Core.require_api("default-nodes", function(dna)
  local defn_id = dna:call("get-default-node", "Audio/Sink")

  obj_mgr = ObjectManager {
    Interest { type = "node",  Constraint {"media.class", "matches", "Audio/Sink"} }
  }

  obj_mgr:connect("installed", function (om)
    for node in om:iterate() do
      local id = node["bound-id"]
      local desc = node["global-properties"]["node.description"]
      local star = defn_id == id and "*" or " "
      print(star.." "..id.." "..desc)
    end
    Core.quit()
  end)

  obj_mgr:activate()
end)

$ chmod +x pw_sinks.lua
$ ./pw_sinks.lua

#!/usr/bin/wpexec

-- To set new default id run the script with `set-default=id` argument, e.g.
--     ./pw_sinks.lua set-default=50

args = ...
new_default = tonumber(args["set-default"] or args["set_default"])

Core.require_api("default-nodes", "mixer", function(DNA, MXR)
  local default_id = DNA:call("get-default-node", "Audio/Sink")

  obj_mgr = ObjectManager {
    Interest { type = "node",  Constraint {"media.class", "matches", "Audio/Sink"} }
  }

  obj_mgr:connect("installed", function (om)
    if new_default then
      if om:lookup({ Constraint {"bound-id", "=", new_default, type="gobject"} }) then
        default_id = new_default
      else
        -- On error, will print to stdout:
        print("pw-sinks.lua: set-default error: No such audio sink id: " .. new_default)
        goto quit
      end
    end
    for node in om:iterate() do
      local id = node["bound-id"]
      local volt = MXR:call("get-volume", id)
      local vol = math.floor(math.pow(volt.volume, 1/3) * 100 + 0.5)
      local mut = volt.mute and " (muted)" or ""
      local props = node["global-properties"] 
      local name = props["node.name"]
      local nick = props["node.nick"]
      local desc = props["node.description"]
      local is_default = default_id == id
      local star = is_default and "*" or " "
      print(string.format("%s %d : %d%%%s : %s (%s) ", star, id, vol, mut, nick, desc))

      if new_default and is_default then
        DNA:call("set-default-configured-node-name", "Audio/Sink", name)
      end
    end
    ::quit::
    Core.quit()
  end)

  obj_mgr:activate()
end)

./pw_sinks.lua                 # выведет все синки
./pw_sinks.lua set-default=50  # установит синк с id=50 в качестве дефолтного