This is a port of openbsd cu(1) to Linux. cu is used to connect to another system over a serial link. In the era before modern networks, it was typically used to connect to a modem in order to dial in to a remote host. It is now frequently used for tasks such as attaching to the serial console of another machine for administrative or debugging purposes. When working with an embedded Linux box, it is useful to setup the tty device in embedded os with the rows and columns of the terminal in the host os. The termsize[1] script by Akkana Peck is quite useful[2] for this task. [1] https://github.com/akkana/scripts/blob/master/termsize [2] http://shallowsky.com/blog/hardware/serial-24-line-terminals.html