在linux 列出 超级用户 普通用户和 系统用户

#!/bin/bash

echo Please select which list you want to print
echo "1. admin (enter 1)"
echo "2. system(enter 2)"
echo "3. normal(enter 3)"
read DATA
if [ $DATA -eq  ]
then
awk -F":" '$3==0 {print}' /etc/passwd
elif [ $DATA -eq  ]
then
awk -F":" '$3>=1&&$3<=500||$3==65534 {print}' /etc/passwd
elif [ $DATA -eq  ]
then
awk -F":" '$3>500&&$3<65534 {print}' /etc/passwd
else
echo Wrong Input,Please re-run the software.
fi