Shell脚本写的简单字符串hash函数

#!/bin/bash

Letter2Int(){
	if [ "$#" -ne "0" ]; then
		echo "Letter2Int Wrong Paramenters!" >&2
		return 1
	fi
	read letter
	length=`echo $letter|awk '{printf("%d", length($0))}'`
	if [ "$length" -ne "1" ]; then
		echo "Letter2Int: more than one letter: $letter!" >&2
		return 1
	fi
	printf "%d" "'$letter"
	return 0
}

Hash(){
	if [ "$#" -ne "1" ]; then
		echo "Hash Wrong Paramenters!" >&2
		return 1
	fi
	read string
	length=`echo $string|awk '{printf("%d", length($0))}'`
	if [ "$length" -eq "0" ]; then
		echo "Hash: At least one letter should be input!" >&2
		return 1
	fi
	iCount=1
	letterSum=0
	while [ "$iCount" -le "$length" ]
	do
		letterCur=`expr substr $string $iCount 1`
		letterNumCur=`printf "%d" "'$letterCur"`
		echo "$letterCur $letterNumCur"
		letterSum=`expr $letterSum + $letterNumCur`
		iCount=`expr $iCount + 1`
	done
	echo $letterSum
	letterSum=`expr $letterSum % $1`
	echo $letterSum
	return 0
}

read letter
echo $letter|Hash 10

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