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登录时自动运行ssh-agent 添加eval $(ssh-agent -s)到.bashrc 退出登录时自动退出ssh-agent 添加trap 'eval $(ssh-agent -s...

dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com

cat /dev/urandom |tr -dc 'a-zA-Z0-9'|fold -w 20 |head -n 10

# 允许 magic SysRq 功能 echo 1 > /proc/sys/kernel/sysrq # 立即重启 echo b > /proc/sysrq-trigger