显示系统基本信息

#!/bin/bash
clear  
if [[ $# -eq 0 ]];then 
    echo -e '\E[33m'"###########系统分析##########"
fi
output=$(tput sgr0)
os=$(uname -o)
echo -e '\E[32m'"系统类型:"$output $os
os_name=$(cat /etc/issue |grep -e "Server")
echo -e '\E[33m'"系统版本:"$output $os_name
os_bit=$(uname -m)
echo -e '\E[34m'"系统位数:"$output $os_bit
os_kernel=$(uname -r)
echo -e '\E[35m'"内核版本:"$output $os_kernel
echo -e "\E[33m主机名: \033[0m" $(hostname)
ipinner=$(hostname -i)
echo -e '\E[36m'"内网ip:"$output $ipinner
outer=$(curl -s http://ipecho.net/plain)
echo -e '\E[29m'"外网ip:"$output $outer
nameservers=$(cat /etc/resolv.conf |grep -E "\<nameserver[ ]"+|awk '{print $NF}')
echo -e '\E[31m'"系统DNS:"$output $nameservers
ping -c 2 www.toutiao.com &>/dev/null && echo "网络连通：Yes" || echo "网络连通：No"
who > /tmp/who  
echo -e '\E[32m'"当前登录用户:"$output && cat /tmp/who
rm -rf /tmp/whoecho 
Mbsystem_men=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}END{print (total-free)/1024}' /proc/meminfo)
Mbapp_men=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}/^Cached/{cached=$2}/Buffers/{buffers=$2}END{print (total-free-cached-buffers)/1024}' /proc/meminfo)
free_mem=$(free -m |awk '/Mem/{print $4}')
echo -e '\E[36m'"系统使用内存:" $output $Mbsystem_men"M" 
echo -e '\E[36m'"应用程序使用内存: "$output $Mbapp_men"M"
echo -e '\E[36m空闲内存: \033[0m' "$free_mem"M
echo -e '\E[33m #################################\033[0m'