首先安装好 zsh
apt install -y zsh git然后把 oh my zsh 克隆到本地，因为我的国内服务器访问不到github，所以要改一下地址，改成cnpm的加速镜像地址
git clone https://github.com.cnpmjs.org/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh标签： Bash
cat <<EOT >> greetings.txt
line 1
line 2
EOT方法二：
echo "line 1
line 2" >> greetings.txt参考：
shell – How to append multiple lines to a file – Unix & Linux Stack Exchange