1.

for i in `seq -w 10`
do
   if  id user-$1 > /dev/null;then
       read -ep "user-$i用户已存在，是否删除(y/n)" ss
       if [ $ss = y ];then
          userdel -rf user-$i
       elif [ $ss = n ];then
          continue
       else
          "输入有误"
       fi
   else
      useradd user-$i
        if [ $i -eq 0 ];then
          echo "user-$i 创建成功"
          passwd="user`cat /dev/random | head -1 | md5sum | head -c 5`"
          echo "user-$i:$passwd" chpasswd
          echo "user-$i--$passwd" >> user.txt
   else
          echo "user-$i 创建失败"
       fi
   fi
done

　　2.

#/bin/bash
echo "创建成功的用户" > /root/user_name
read -ep "请输入要创建的用户:" num
for i in `seq 1 $num`
do
  pw=`cat /dev/urandom | head -1 | md5sum | head -c 5`
  id wg$i > /dev/null 2>&1
  if [ $? -eq 0 ];then
  while true
  do
        read -ep "wg$i用户已经存在，是否删掉该用用户(y/n):" select
        case $select in
        y|Y)
          userdel -rf wg$i > /dev/null
          echo "wg$i成功删除"
          break
        ;;
        n|N)
        break
        ;;
        *)
        echo "输入的字符有误,请重新输入"
        esac
   done
 else
   useradd wg$i > /dev/null 2>&1
   if [ $? -eq 0 ];then
        echo "wg$i用户创建成功"
        echo "wg$pw" | passwd --stdin wg$i
        echo "wg$i $pw " >> /root/user_name
   fi
 fi
done