面试题：Bash字符串搜索与替换的复杂应用

Question

有一个Bash脚本，其中定义了一个长字符串text='The old dog runs fast. The old cat jumps high. The old bird flies away'，要求编写代码将字符串中所有出现的'old'替换为'young'，并且将替换后的字符串按句子（以句号.分隔）拆分成数组，然后遍历数组并输出每个句子的长度。

Answer 1

#!/bin/bash

text='The old dog runs fast. The old cat jumps high. The old bird flies away'
new_text=${text//old/young}
sentences=(${new_text//./ })

for sentence in "${sentences[@]}"; do
    length=${#sentence}
    echo "句子长度: $length"
done