操作步骤如下：
- 编辑
vim /jiaoben/dynmotd.sh文件，拷贝下文脚本内容 - 赋予x执行权限
chmod +x /jiaoben/dynmotd.sh - 将文件追加到profile中
echo /jiaoben/dynmotd.sh >> /etc/profile - 重新登录服务器进行验证
# System load
LOAD1=`cat /proc/loadavg | awk {'print $1'}`
LOAD5=`cat /proc/loadavg | awk {'print $2'}`
LOAD15=`cat /proc/loadavg | awk {'print $3'}`
MEMORY=`free -mh | grep "Mem" | awk '{print "used:",$3,"/",$2,"( free: ",$4,")"}'`
MEM_USAGE=`free -m | grep "Mem" | awk '{printf("%3.1f%%", (($3/$2)*100))}'`
DISK=`df -Ph / | awk '/\// {print "used:",$3,"/",$2," ( free:",$4,")"}'`
DISK_USAGE=`df -h / | awk '/\// {print $5}'|grep -v "^$"`
echo "
===========================================================================
- Release.............: `cat /etc/redhat-release`
- Kernel..............: `uname -r`
- Hostname............: `uname -n`
- Username............: `whoami`
- IP..................: `hostname -I`
- Login Users.........: Total `users | wc -w` user(s)
===========================================================================
- CPU usage...........: $LOAD1 - $LOAD5 - $LOAD15 (1-5-15 min)
- Memory..............: $MEMORY
- Memory usage........: $MEM_USAGE
===========================================================================
- Mem info:
`free -mh`
- Disk info:
`df -h`
- Net info:
`netstat -ntpl`
===========================================================================
"
