Linux常用命令
1.查看系统版本:
1.cat /etc/redhat-release
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.8.2003 (Core)
2.rpm -q redhat-release
rpm -q centos-release #根据自己系统来
[root@localhost ~]# rpm -q centos-release
centos-release-7-8.2003.0.el7.centos.x86_64
3.uname -a
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
4.cat /proc/version
[root@localhost ~]# cat /proc/version
Linux version 3.10.0-1127.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) ) #1 SMP Tue Mar 31 23:36:51 UTC 2020
2.查看端口
ss -tuln #查看目前系统正在使用的端口
lsof -i:50000 #50000为需要查看的端口,如果有信息显示则表示端口为开放状态,无显示为端口关闭
lsof -i -P -n |grep LISTEN #查看监听中的服务及端口
3.防火墙
ufw status #查看ufw的状态
ufw enable #开启ufw防火墙
ufw allow xxx/tcp #在防火墙上放开指定端口和协议