PowerShell过滤文件中的重复内容

Get-Content -Path E:	est11data.txt | Sort-Object | Get-Unique

源文件：

AA0001 2014-06-30 15:27:13.073
AA0001 2014-06-30 15:27:13.073
AA0001 2014-06-30 15:27:13.073
AA0002 2014-06-30 15:27:30.607
AA0002 2014-06-30 15:28:00.467
AA0003 2014-06-30 15:28:20.297
AA0003 2014-06-30 15:28:20.297

过滤后：

AA0001 2014-06-30 15:27:13.073
AA0002 2014-06-30 15:27:30.607
AA0002 2014-06-30 15:28:00.467
AA0003 2014-06-30 15:28:20.297

过滤后，另存为新的文件，可以这样：

Get-Content -Path E:	est11data.txt | Sort-Object | Get-Unique | Out-File -FilePath E:	est11NewData.txt