[root@centos1 ~]# ifconfig -bash: ifconfig: command not found
[root@centos1 ~]# echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
[root@centos1 ~]# ls /usr/sbin/
[root@centos1 ~]# find / -name "ifconfig"
[root@centos1 ~]# ip addr
[root@centos1 ~]# ls /etc/sysconfig/network-scripts/ ifcfg-enp2s0 ifdown-eth ifdown-post ifdown-Team ifup-aliases ifup-ipv6 ifup-post ifup-Team init.ipv6-global ifcfg-lo ifdown-ippp ifdown-ppp ifdown-TeamPort ifup-bnep ifup-isdn ifup-ppp ifup-TeamPort network-functions ifdown ifdown-ipv6 ifdown-routes ifdown-tunnel ifup-eth ifup-plip ifup-routes ifup-tunnel network-functions-ipv6 ifdown-bnep ifdown-isdn ifdown-sit ifup ifup-ippp ifup-plusb ifup-sit ifup-wireless
[root@centos1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp2s0 HWADDR=00:E0:69:01:6A:96 TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp2s0 UUID=5b0a7d76-1602-4e19-aee6-29f57618ca01 ONBOOT=no
[root@centos1 ~]# shutdown -r
[root@centos1 ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:e0:69:01:6a:96 brd ff:ff:ff:ff:ff:ff
inet 172.8.1.200/24 brd 172.8.1.255 scope global enp2s0
valid_lft forever preferred_lft forever
inet6 fe80::2e0:69ff:fe01:6a96/64 scope link
valid_lft forever preferred_lft forever
[root@centos1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp2s0 HWADDR=00:E0:69:01:6A:96 TYPE=Ethernet #BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp2s0 UUID=5b0a7d76-1602-4e19-aee6-29f57618ca01 ONBOOT=yes IPADDR0=172.8.1.211 PREFIX0=24 GATEWAY0=172.8.1.1 DNS1=172.8.1.1
[root@centos1 ~]#yum install net-tools
[root@linux ~]# ifup {interface}
[root@linux ~]# ifdown {interface}
[root@linux ~]# ifup eth0
[root@linux ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
echo "ONBOOT=yes" >> /etc/sysconfig/network-script/ifcfg-eth0
[root@CentOS2 ~]# /etc/init.d/network restart
[root@CentOS2 ~]# service network restart
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