shell编程 批量创建用户（不需要文件操作）

#!/bin/bash

read -p "qianzhui: " u_name
read -p "weizhui: " nu_nu
read -p "startnum: " nu_start
read -p "weishu: " nu_amount

nu_end=$(($nu_start+$nu_amount-1))

for (( i=$nu_start;i<=$nu_end;i=i+1))
do
nu_len=${#i}
nu_diff=$(($nu_nu-$nu_len))
if [ "$nu_diff" != "0" ];then
nu_nn=000000
nu_nn=${nu_nn:1:$nu_diff}
fi
account="$u_name""$nu_nn""$i"
useradd $account
echo $account | passwd --stdin $account
done
echo "OK"