将一个子字符串替换为Shell脚本中的另一个字符串

问题：

I have "I love Suzi and Marry" and I want to change "Suzi" to "Sara". 我有“我爱Suzi和结婚”，我想将“ Suzi”更改为“ Sara”。

#!/bin/bash
firstString="I love Suzi and Marry"
secondString="Sara"
# do something...

The result must be like this: 结果必须是这样的：

firstString="I love Sara and Marry"

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解决方案：

参考一： https://stackoom.com/question/tQki/将一个子字符串替换为Shell脚本中的另一个字符串
参考二： https://oldbug.net/q/tQki/Replace-one-substring-for-another-string-in-shell-script

来源：oschina

链接：https://my.oschina.net/u/4428122/blog/4338463