使用Group-Object进行分组

对不同类型文件分组，并分别统计其数量
get-childitem | group-object extension -noelement

Count Name
----- ----
1 .android
9
1 .rnd

 

找出数量多于1个字符
"a", "b", "c", "c", "d" | group-object -noelement | where {$_.Count -gt 1}

Count Name
----- ----
2 c

返回唯一值
"a", "b", "c", "c", "d" | get-unique