有台虚拟机，用的时候发现ifconfig命令不好用了，提示如下：
Command 'ifconfig' is available in '/sbin/ifconfig'
The command could not be located because '/sbin' is not included in the PATH environment variable.
This is most likely caused by the lack of administrative privileges associated with your user account.
ifconfig: command not found
根据提示，/sbin/这个路径并没有添加到系统的PATH。排查发现是/etc/bash.bashrc下的PATH被修改了，在最后添加上系统路径的配置即可：
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:$PATH