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Ubuntu 16.04

I need /dev/ttyS0 (serial port) for use in my application.

Command: 

~$ dmesg | grep tty

Response with: 

[    0.000000] console [tty0] enabled
[    0.691609] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.715333] 00:06: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

How do I close the serial port (for current session only is also ok) so I can use it for my own needs?

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  • 1
    What application is using the serial port? How do you know you can't use it?
    – Mokubai ♦
    Aug 19, 2016 at 21:35
  • for instance I'm trying to open the port (/dev/ttyS0) using PuTTY and it fails with message "unable to open serial port"
    – teach me
    Aug 19, 2016 at 22:08
  • 2
    Thanks @drewbenn your comment solved the issue. I added my self to the dialout group and it work like a charm
    – teach me
    Aug 20, 2016 at 11:16

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