linux运维脚本-系统登陆提示

效果

脚本（复制粘贴）

#!/bin/bash
echo 
a="3[40;37m"
e="3[0m"
b="3[41;37m"
c="3[42;37m"
f="3[43;37m"
g="3[44;37m"
h="3[45;37m"
q="3[46;37m"
cron=`crontab -l`
echo -e $a 'This is a private server,please leave,thanke you!' $e 
echo
echo -e $a Welcome $USER To Login To This Server! $e
echo
LoginUserNum=`who | wc -l`

OpenProcesNum=$(expr $(ps aux | wc -l) - 1)

FreeMem=`free -m | grep Mem: | awk '{print $4}'`

FreeBuffers=`free -m | grep - | awk '{print $3}'`

FreeCache=`free -m | grep - | awk '{print $4}'`

FreeSwap=`free -m | grep Swap: | awk '{print $4}'`

echo -e  " $a number of login users '(用户数量)': $e" $LoginUserNum 
echo -e  " $b $LoginUserNum $e"
echo -e  " $a numbre of running processes '(进程)': $e" $OpenProcesNum 
echo -e  " $f $OpenProcesNum $e"
echo -e  " $a free memory size '(mb 可用内存)': $e" $FreeMem 
echo -e  " $c $FreeMem $e"
echo -e  " $a free buffers size'(mb 内存可用缓存)': $e" $FreeBuffers 
echo -e  " $g $FreeBuffers $e"
echo -e  " $a free cache'(mb 可用缓存)': $e" $FreeCache 
echo -e  " $h $FreeCache $e"
echo -e  " $a free swap space size '(mb 交换内存)': $e" $FreeSwap 
echo -e  " $q $FreeSwap $e"
echo -e  " $a view crontab $e "    
echo -e  " $b $cron $e"