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标题: [转载代码] [PowerShell每日技巧]根据文件夹前缀进行分组(20131206) [打印本页]

作者: DAIC 时间: 2013-12-9 10:27 标题: [PowerShell每日技巧]根据文件夹前缀进行分组(20131206)

Did you know that Group-Object can easily group elements by custom criteria? Here's a line that groups folders by their first three letters:

Get-ChildItem -Path C:\Windows -Directory |
   Group-Object -Property { $_.Name.PadRight(3).Substring(0,3)}
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And with little additional effort, you can create a hash table that uses these three letters as a key:

$lookup = Get-ChildItem -Path $env:windir -Directory  |
   Group-Object -Property { $_.Name.PadRight(3).Substring(0,3).ToUpper()} -AsHashTable -AsString

$lookup.Keys
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So now it is really trivial to get all folders that, let's say, start with "SYS":

PS>powershell -f test.ps1

Directory: C:\Windows

Mode             LastWriteTime    Length Name
----             -------------    ------ ----
d----       11/27/2013 8:36 AM          System32
d----       11/27/2013 8:36 AM          SysWOW64

And why is that useful? Some companies use folder prefixes for business units. With this technique, it's easy to bundle all business unit folders together - you could then sum up their total storage space in a second step and create automatic reporting.

http://powershell.com/cs/blogs/tips/archive/2013/12/06/getting-folders-by-prefix.aspx

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