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#!/bin/sh index_char() { # 参数需>=两个 if [ $# -lt 2 ]; then echo 'Lack of Parameters' return fi # n: 待索引第n个字符 declare -i n if [ $# -eq 2 ]; then n=1 elif [ $# -eq 3 ]; then n=$3 fi string=$1 target=$2 declare -i target_len=`expr length $target` if [ $target_len -gt 1 ]; then echo 'Not support to index string' return fi declare -i left=0 declare -i index=0 declare -i len=${#string} declare -i result=0 for i in `seq $n`; do index=`expr index $string $target` left=$len-$index string=${string:$index:${left}} result=$result+$index if [ $index -eq 0 ]; then echo 'Out Of Range' break; fi done echo $result } index_char $@ |