(linux) (bash) communcating to telnet or serial port

[Telnet]

• 寫入command至telnet 終端:

  (echo "command") | telnet 192.168.1.1
  

[Serial port]

• 使用stty設定serial port

  stty -F /dev/ttyS0 speed 9600 -icrnl
  stty -F <dev> speed  <baudrate> -icrnl
  

  *-crnl: translate carriage return to a newline

• 寫入 command至serial port:

  (echo "command") | > /dev/ttyS0
  

• 讀取serial port上回傳值:

  cat /dev/ttyS0
  read /dev/ttyS0 > /dev/tty