重定向运算符

Mode         LastWriteTime         Length      Name                                                                  
----        -------------          ------     ----                                                                  
d-----       30-09-2019   05:49               images
d-----       09-10-2019   11:14               files
d-----       09-10-2019   11:56               powershell
d-----       09-10-2019   10:58               users
d-----       09-10-2019   04:37               Windows
-a----       05-11-2019   14:53      0        k.txt
-a----       25-06-2018   09:46      2179     powershell.txt

Write-Error "hello"  : hello
At line:1 char:1+ &{Write-Error "hello" }2>&1 > D:\k.txt
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException