CU: Serial terminal emulator

cu，個人覺得是一個簡單、方便的 serial console 連線工具。

第一次看到是在 debian 上，透過 apt-cache search 找到的工具，裝好就可以用了。後來，在 OpenBSD 上就沒找到 cu。一度以為沒有這個工具，也試著想找它的 source code 來在 OpenBSD 上自編譯、使用未果。

這幾天在試玩新的 OpenBSD 4.8 時，才發現原來早就內建在系統中，我真是後知後覺啊!! orz
$ sudo cu -l /dev/cuaU0 -s [speed]
超方便，但功能不會陽春哩!

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