小火车：
yum -y install sl
sl
while true;do sl;done //循环
代码雨：
yum -y install wget
wget https://jaist.dl.sourceforge.net/project/cmatrix/cmatrix/1.2a/cmatrix-1.2a.tar.gz
tar xvf cmatrix-1.2a.tar.gz
yum -y install gcc
yum -y install gcc-c++
yum -y install make
cd cmatrix-1.2a
yum -y install ncurses-devel
./configure && make && make install
cmatrix