Testing

There are differences between OS’s.spring-doc.cn

Within the same OS there may be different shell implementations in use.spring-doc.cn

What goes into a shell and comes out from a shell may be totally different from what you see in the shell itself due to invisible control characters.spring-doc.cn

The shell may feel synchronous but most likely it is not, meaning when something is written into it, you can’t assume next update in it is not final.spring-doc.cn