Testing

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

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

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

Shell may feel syncronous but most likely it is not meaning when someting is written into it, you can’t assume next update in in it is not final.spring-doc.cn