#查找包含 “Timeout” 的日志行，并提取IP地址
cat /var/log/messages | awk ‘/Timeout/ {print $6}’ | sort | uniq
grep “Timeout” /var/log/messages
Oct 18 11:28:10 VM-0-9-tencentos pure-ftpd[3911553]: (abc@120.225.245.198) [INFO] Timeout – try typing a little faster next time
Oct 18 11:38:03 VM-0-9-tencentos pure-ftpd[3914600]: (abc@221.237.120.68) [INFO] Timeout
Oct 18 11:39:05 VM-0-9-tencentos pure-ftpd[3914808]: (abc@221.237.120.68) [INFO] Timeout
Oct 18 11:39:27 VM-0-9-tencentos pure-ftpd[3914964]: (abc@221.237.120.68) [INFO] Timeout
Oct 18 11:40:18 VM-0-9-tencentos pure-ftpd[3915282]: (abc@221.237.120.66) [INFO] Timeout
Oct 18 11:41:25 VM-0-9-tencentos pure-ftpd[3915737]: (abc@221.237.120.66) [INFO] Timeout
Oct 18 11:42:39 VM-0-9-tencentos pure-ftpd[3916063]: (abc@221.237.120.68) [INFO] Timeout
Oct 18 11:50:36 VM-0-9-tencentos pure-ftpd[3916155]: (abc@221.237.120.68) [INFO] Timeout