Hello, Debian!

Command

Entering shutdown -c to to cancel the reboot when using shutdown command to reboot.

halt --------------------------------------------# poweroff now(use-p to turn off the power)
poweroff -------------------------------------# poweroff now
shutdown -h now ---------------------------# poweroff now
shutdown -h 10 -----------------------------# poweroff in 10 minutes

Entering shutdown -c to to cancel the poweroff when using shutdown command to power off.

uptime --------------------------------------------#
apt-get install <>=<> -----------# 安装指定指定版本: apt-get -y install nginx=1.14.2-1~xenial
ip addr ---------------# Check IP address.
ip a ---------------# Check IP address.
ip address show ---------------# Check IP address.
ip -br -c a ---------------# Check IP address.
telnet xxx.xxx.xxx.xxx 22 ---------# Check port number
route -n -----------------# Show route information
ls --color ---------------# Show color in terminal
vi ~/.bashrc ------------------# 如何让debian终端显示颜色?
pmset -g batt ---------------# Check battery status
factor

touch name.format -------------------------# To create a new file.
cat name.format ----------------------------# To preview the contents.
apt list --installed --------------------------# 这个会显示使用 apt 命令安装的所有的软件包。同时也会包含由于依赖而被安装的软件包。也就是说不仅会包含你曾经安装的程序，而且会包含大量库文件和间接安装的软件包。
apt list --installed | grep program_name ------# 可以检索出使用 .deb 软件包文件安装的软件。由于列出出来的已安装的软件包太多，用 grep 过滤特定的软件包是一个比较好的办法。
dpkg-query -l --------------------------#
修改sshd_config文件，命令为: vi /etc/ssh/sshd_config
启动SSH服务，命令为: /etc/init.d/ssh start // 或者service ssh start
验证SSH服务状态，命令为: /etc/init.d/ssh status
添加开机自启动 update-rc.d ssh enable
cat >> /etc/ssh/sshd_config << EOF PasswordAuthentication yes PermitRootLogin yes EOF service ssh restart
/etc/init.d/ssh status

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