linux 命令

1.  查看linux发行版
       cat /etc/issue
       cat /etc/redhat-release
       lsb_release -a
       cat /etc/*-release
       grub.conf 也有点提示   /etc/issue通用~   /etc/redhat-release只有RH系有~       
       rpm -qa|grep release

2.  显示网络状态
       netstat [-acCeFghilMnNoprstuvVwx][-A网络类型>][--ip]
       netstat -nltp

3.  获取当前登录用户的ip地址
       # who -u
       # who -u am i
       # who am i
       # echo $SSH_CONNECTION
       # w

4.  curl -I