先修改文件 /etc/issue 改为相要显示的内容， 再修改文件 /etc/rc.d/rc.local(RedHat) 或 /etc/rc.d/rc.S(Slackware) 把下面几句注释掉：
# This will overwrite /etc/issue at every boot. So, make any changes you
# want to make to /etc/issue here or you will lose them when you reboot.
echo "" > /etc/issue
echo "Red Hat Linux $R" >> /etc/issue
echo "Kernel $(uname -r) on $a $(uname -m)" >> /etc/issue
cp -f /etc/issue /etc/issue.net
echo >> /etc/issue
不然的话每次重新启动 /etc/issue 都会被更改。
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