setup
CTRL+ALT+F2/3/4/5/6进入全黑屏模式终端下;
CTRL+ALT+F1进入GUI仿真终端模式下;
init 3可进入黑屏模式;
init 5可进入仿真模式;
systemctl status firewalld
systemctl stop firewalld
systemctl start firewalld
systemctl enable firewalld
systemctl disable firewalld
reset
clear
alias
yum install tree
tree 目录
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