练习_for循环创建用户

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#!/usr/bin/bash read -p "please input number：" num   if [[ ! "$num" =~ ^[0-9]+$ ]];then         echo "error number"         exit fi     read -p "please input prefix：" prefix   if [ -z $prefix ];then         echo "error prefix" fi   for i in `seq $num` do         user=$prefix$i         usesradd $user         echo "123" |passwd --sdtin $user &>/dev/null         if [ $? -eq 0 ]; then                 echo "$user is created"         fi done