user_del.sh

#!/bin/bash

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

echo "users(uid >= 1000) are all deleted."
exit 0

验证：

[root@logstash ~]# sh user_del.sh 
users(uid >= 1000) are all deleted.
[root@logstash ~]#