A utility that splits the I/O of one process into two pseudoterminals.
make install
Uninstall with:
make uninstall
teeterm COMMAND [ARGS]
teeterm will launch COMMAND [ARGS], print out the paths of two pseudoterminals, create links pty0 and pty1 to them in the current directory, then wait for a SIGINT (ctrl-c).
Upon termination, the links pty0 and pty1 will be removed.
The pseudoterminals each have access to the I/O of COMMAND. The input from either will be sent to the process, and the output from the process will be sent to both terminals.
An example usage given here is to "duplicate" a terminal:
teeterm picocom /dev/ttyUSB0 -b115200
(In another shell) picocom pty0
(In another shell) picocom pty1
For a typical serial terminal, commands may be entered into either pty and the same output is seen on both terminals.
Even more useful, other programs such as expect should be able to interact with one of the terminals. This would enable the user to keep a serial terminal open for development, but also run scripts that automate some of the work.
I asked this question on the unix stack exchange. The user "dirkt" provided an excellent related code example for the subject. This is also a useful read on controlling programs with pseudoterminals, though a forkpty call turned out to be far more convenient than their examples.
The Unlicense. This project is truly free, and public domain.