之前用过VirtualBox虚拟机，但是用VB有个很麻烦的事情，不能发送Ctrl+Alt+Fn键切换虚拟终端。因为这个中断会被Host机捕捉到，而有时候又很需要字符终端，总不能每次都切换运行级别吧？
后来看红帽的教材的时候看到一个命令，chvt。很好地解决了这个问题，命令很简单，
# chvt num
num是要切换到的终端。例如我想切换到第二个字符终端，只需要输入
# chvt 2
就可以了。
Here is the man page:
NAME
chvt - change foreground virtual terminal
SYNOPSIS
chvt N
DESCRIPTION
The command chvt N makes /dev/ttyN the foreground terminal. (The cor-
responding screen is created if it did not exist yet. To get rid of
unused VTs, use deallocvt(1).) The key combination (Ctrl-)LeftAlt-FN
(with N in the range 1-12) usually has a similar effect.
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