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tio - a simple TTY terminal I/O application

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1. Introduction

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

It was created because the author needed a simple no-nonsense TTY terminal application to easily connect to various terminal TTY devices.

2. Usage

The commandline interface is straightforward as reflected in the output from '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
      -e, --local-echo            Do local echo
      -l, --log <filename>        Log to file
      -m, --map <flags>           Map special characters
      -v, --version               Display version
      -h, --help                  Display help

    See the man page for list of supported mapping flags.

    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 is unplugged), 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 an established connection is lost.

Tio features full bash autocompletion support.

Tio also supports various key commands. Press ctrl-t ? to list the available key commands.

See the tio man page for more details.

3. Installation

The latest release version is available at

3.1 Installation using release tarball

Install steps:

     $ ./configure
     $ make
     $ make install

See INSTALL file for more installation details.

3.2 Installation using package

Tio comes prepackaged for various GNU/Linux distributions. Visit for package installation details.

4. Contributing

Tio is open source. All contributions (bug fixes, doc, ideas, etc.) are welcome. Visit the tio GitHub page to access latest source code, create pull requests, add issues etc..


Also, if you find this free open source software useful please consider making a donation:


5. Support

Submit bug reports via GitHub:

6. Website


7. License

Tio is GPLv2+. See COPYING file for license details.

8. Authors

Created by Martin Lund <>

See the AUTHORS file for full list of authors.

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