If i have 20 .txt file 。

1..20 | foreach-object {new-item -type file .$_.txt}
get-childitem | rename-item -newname {“newfile$_”}

 You will get picture 1 .

But if you have 50 .txt file . you will have a bug.

1..50 | foreach-object {new-item -type file .$_.txt}
get-childitem | rename-item -newname {“newfile$_”}

Look at picture 2. 

why ??

​If i have 20 .txt file 。 1..20 | foreach-object {new-item -type file .$_.txt}
get-childitem | rename-item -newname {“newfile$_”}  You will get picture 1 .But if you have 50 .txt file . you will have a bug. 1..50 | foreach-object {new-item -type file .$_.txt}
get-childitem | rename-item -newname {“newfile$_”} Look at picture 2. why ??  Read More

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