bash:ifconfig command not found for contos7.0

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: 未找到命令
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

代码如下	复制代码
[root@chaoge ~]# yum install net-tools

已加载插件：fastestmirror

代码如下

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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

软件包 net-tools-2.0-0.17.20131004git.el7.x86_64 已安装并且是最新版本
无须任何处理
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

代码如下

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[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