#!/bin/bash


current_tty=$(tty)

ttys=$(ps aux | grep "$(basename "$SHELL")$" | grep "^$USER\s" | awk '{print("/dev/"$7)}' | grep -v "$current_tty")

while getopts ":l :d :c :s" opt; do

  # shellcheck disable=SC2213
  case $opt in
    l)
      echo -e "$current_tty - Current\n$ttys" | sort
      ;;
    d)
      for i in $ttys
      do
        echo -e "\nkan: detect: $i" > "$i" &
      done
      ;;
    c)
      echo "$current_tty"
      ;;
    s)
      read -r input_text
      for i in $ttys
      do
        echo "$input_text" > "$i"
      done
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      ;;
  esac
done