压缩和解压缩
tar -zcvf 压缩文件名 .tar.gz 被压缩文件名
tar -zxvf 压缩文件名.tar.gz
查看端口号占用
netstat -lnp | grep 80
防火墙
1:查看防火状态
systemctl status firewalld
service iptables status
2:暂时关闭防火墙
systemctl stop firewalld
service iptables stop
3:永久关闭防火墙
systemctl disable firewalld
chkconfig iptables off
4:重启防火墙
systemctl enable firewalld
service iptables restart
5:永久关闭后重启
chkconfig iptables on
查看定时任务日志
cat /var/log/cron | grep CRON
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