#!/bin/bash


user=$(awk -F: ‘$3>=1000{print $1}’ /etc/passwd)
for i in $user
do
    userdel -r $i
done

2.自动优化LINUX内核参数

#!/bin/bash

cat >> /usr/lib/sysctl.d/00-system.conf  < 
3.检测MySQL数据库连接数量 
#!/bin/bash

log_file=/var/log/mysql_count.log
user=root
passwd=123456
while:
do
   sleep 2
   count=`mysqladmin  -u “$user”  -p “$passwd”   status| awk ‘{print $4}’`
   Echo “`date +%Y-%m-%d`并发连接数:$count”  >>$log_file
done