CentOS7刚发布，我忍不住把DELL T410从CentOS6升级到CentOS7。好不容易等安装结束后，立即配置网络，然后在yum源上安装环境。可是执行ifconfig的时候系统提示让我傻了眼
[root@chaoge ~]# ifconfig
-bash: ifconfig: Command not found
这可是新安装的系统，怎么会没找到熟悉ifconfig命令呢？网上搜一下，一大堆人都在说是环境变量问题，但我确信我的/etc/profile设置是对的，于是终于找到一篇文章说是安装下net-tools就好
[root@chaoge ~]# yum install net-tools
Loaded plugins: fastestmirror
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
base | 3.6 kB 00:00:00
extras | 3.3 kB 00:00:00
updates | 3.4 kB 00:00:00
updates/7/x86_64/primary_db | 2.8 MB 00:00:08
Determining fastest mirrors
Package net-tools-2.0-0.17.20131004git.el7.x86_64 already installed and latest version
Nothing to do
因为我已安装过net-tools所以提示我已经安装，现在熟悉的ifconfig又回来了
[root@chaoge ~]# ifconfig
em2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 78:2b:cb:41:9a:03 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.48 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::7a2b:cbff:fe41:9a02 prefixlen 64 scopeid 0x20<link>
ether 78:2b:cb:41:9a:02 txqueuelen 1000 (Ethernet)
RX packets 82668 bytes 7831470 (7.4 MiB)
RX errors 0 dropped 153388 overruns 0 frame 0
TX packets 1276 bytes 204913 (200.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 12 bytes 1071 (1.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12 bytes 1071 (1.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
