按要求生成随机数

```
#!/bin/bash
#Version:0.0.1
#Author:stone
#Description:create random alpha & number.
while :; do
    echo -n -e "\033[31;1mplease input row:\033[0m"
    read ROW
    row1=$(echo "$ROW" |sed 's/[0-9]//g')      #将用户的输入进行过滤
    if [ -z $ROW ]; then
	echo "the input cannot be empty."
	continue                               #输入不能为空
    elif [ "$row1" == "" ]; then
	break				       #满足输入条件退出循环
    else
	continue                               #不满足条件继续循环
    fi
done

while :; do
    echo -n -e "\033[31;1mplease input column:\033[0m"
    read COLUMN
    column1=$(echo "$COLUMN" |sed 's/[0-9]//g')      #将用户的输入进行过滤
    if [ -z $COLUMN ]; then
	echo "the input cannot be empty."
	continue                               #输入不能为空
    elif [ "$column1" == "" ]; then
	break				       #满足输入条件退出循环
    else
	continue                               #不满足条件继续循环
    fi
done

while :; do
    echo -n -e "\033[31;1mplease input descriptor:\033[0m"
    read DS
    ds1=$(echo "$DS" |sed -r 's/([0-9]|[a-z]|[[:space:]])//g')      #将用户的输入进行过滤
    ds2=$(echo "$DS" |sed 's/[[:space:]]//g')
    if [ -z $ds2 ]; then
	echo "the input cannot be empty."
	continue                               #输入不能为空
    elif [ "$ds1" == "" ]; then
	break				       #满足输入条件退出循环
    else
	continue                               #不满足条件继续循环
    fi
done

num1=0                                         #用于数组下标
for i in {a..z}; do                            #将a-z放入数组
    alphabet[${num1}]=$i
    let num1++
done

num2=0                                         #用于数组下标
for j in {0..9}; do                            #将0-9放入数组
    number[${num2}]=$j
    let num2++
done

discription=($DS)                              #将每一列的描述符放入数组

for i in `seq 10`; do
    
for R in $(seq $ROW); do
#    for C in $(seq $COLUMN); do               #取消循环，在遍历数组时已达到要求
	for D in ${discription[*]}; do
            CL=$(echo $D |wc -L)
	    for CHAR in $(seq $CL); do
		CH=$(echo "$D" |cut -c ${CHAR})
                alpha=$(($RANDOM%26))                #获取字母数组的随机下标
	        num=$(($RANDOM%10))                  #获取数字数组的随机下标
		alpha1=alphabet[$alpha]
		num3=number[$num]
		eval array1=$(echo \${$alpha1})
		eval array2=$(echo \${$num3})
		echo "$CH" |grep "[[:digit:]]" > /dev/null
		if [ "$?" == "0" ]; then
		    LINE="${LINE}${array2}"
 		fi

echo "$CH" |grep "[[:alpha:]]" > /dev/null
		if [ "$?" == "0" ]; then
		    LINE="${LINE}${array1}"
		fi
	    done
            LINE="${LINE}	"
        done
        echo $LINE >> /tmp/${i}.txt
        unset LINE
#    done
done

done
```

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