生成 SSH 密钥

# ed25519 算法
ssh-keygen -t ed25519 -a 100 -C "$(whoami)@mac-$(date +'%Y%m%d')" -f ~/.ssh/feitsui

# rsa 算法
ssh-keygen -t rsa -b 2048 -C "$(whoami)@mac-$(date +'%Y%m%d')" -f ~/.ssh/feitsui

# 修改权限
chmod 600 ~/.ssh/feitsui