A simple TTY terminal I/O application

Tio demo

What is tio?

"tio" is a simple TTY terminal application which features a straightforward commandline interface to easily connect to TTY devices for basic input/output.


The commandline interface features the following options:

$ tio --help
Usage: tio [<options>] <tty device>

  -b, --baudrate <bps>        Baud rate (default: 115200)
  -d, --databits 5|6|7|8      Data bits (default: 8)
  -f, --flow hard|soft|none   Flow control (default: none)
  -s, --stopbits 1|2          Stop bits (default: 1)
  -p, --parity odd|even|none  Parity (default: none)
  -o, --output-delay <ms>     Output delay (default: 0)
  -n, --no-autoconnect        Disable automatic connect
  -l, --log <filename>        Log to file
  -m, --map <flags>           Map special characters
  -v, --version               Display version
  -h, --help                  Display help

In session, press ctrl-t + q to quit.

The only option which requires a bit of elaboration is perhaps the --no-autoconnect option.

By default tio automatically connects to the provided device if present. If the device is not present it will wait for it to appear and then connect. If the connection is lost (eg. device disconnects) it will wait for the device to reappear and then reconnect.

However, if the --no-autoconnect option is provided tio will exit if the device is not present or exit if an established connection is lost.

Features full bash autocompletion support.


From source tarball:

$ ./configure
$ make
$ make install

Ubuntu / Debian:

$ apt install tio

Fedora / RHEL:

$ dnf install tio


$ cd /usr/ports/comms/tio
$ make install clean

LEDE Project/OpenWrt

$ opkg install tio

Arch Linux:

AUR package is available here.


$ snap install tio --classic

Visit snapcraft.io to see how to install snap for your distribution.


Tio is open source released under the GPLv2+ license.


Please submit bug reports etc. via GitHub here.

If you find this free open source software useful please consider making a donation.