有时候需要 mac 做一些事情，不希望它一段时间后自动休眠，又不想修改默认的休眠设置（临时起意，平时还是需要它尽快休眠省电）。可以用过 caffeinate 命令来阻止 mac 休眠。
使用方法：
# 阻止机器休眠（后台跑程序、听歌等，屏幕过段时间后会自动关闭）
caffeinate
# 阻止屏幕（-d display）休眠
caffeinate -d
xkniu
/ ssh-login-on-new-server.sh
Created
September 2, 2018 17:00
Create user on sever and set ssh login
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| # Add a new user if needed | |
| useradd foo | |
| passwd foo | |
| # Create ssh directory in new user home | |
| # Add your publish key to it | |
| cd ~ && mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys | |
| # Set ssh directory permissions (http://www.openssh.org/faq.html#3.14) | |
| chmod 700 ~/.ssh |