Powertip of the day from powershell.com last week Summary (7)

 

Use scripts to verify input parameters

Using scripts to validate input

Http://powershell.com/cs/blogs/tips/archive/2010/08/30/using-scripts-to-validate-input.aspx

PassValidatescript.

Function copy-oldfiles {
Param (
$ Days = 30,
[Parameter (valuefrompipeline = $ true)]
[System. Io. fileinfo]
[Validatescript ({(New-timespan $ _. lastwritetime). Days-GT $ days})]
$ Fileobject
)

Process {
"Archiving file {0} (age {1})..."-F $ fileobject. fullname, (new-timespan $ _. lastwritetime). Days
}
}

I personally feel that it is easier to understand and implement in the method body.

 

 

View Object Inheritance relationships

View Object Inheritance

Http://powershell.com/cs/blogs/tips/archive/2010/08/31/view-object-inheritance.aspx

APstypenamesThe hidden attribute of can display the inheritance connection of an object.

(Get-wmiobject win32_bios). pstypenames

AndGetType ()This property is valid for all objects, includingComObject. The most common method is to obtain the first element of the inheritance chain:

(Get-wmiobject win32_bios). pstypenames [0]

 

 

Version Comparison

Comparing versions

Http://powershell.com/cs/blogs/tips/archive/2010/09/01/comparing-versions.aspx

When comparing the versions saved by two string types,PowershellIt uses characters and numbers.Algorithm(?) For example:

'A'-GT 'B'

False

The following error is returned:

'3. 4.22.12 '-GT '22. 1.4.34'

True

You need to setStringType conversionSystem. VersionType. In fact, you only need to convert the type on the left, because the right side will also be converted as follows:

[System. Version] '3. 4.22.12 '-GT '22. 1.4.34'

False

 

 

Type accelerator (?)

Type accelerators

Http://powershell.com/cs/blogs/tips/archive/2010/09/02/type-accelerators.aspx

PowershellFor some. NetType provides some shortcuts, suchWMI,ADSIOrInt, You can useFullnameAttribute to get the full name of a type name:

[WMI]. fullname

System. Management. managementobject

 

 

Direct AccessWMIInstance

Accessing WMI instances directly

Http://powershell.com/cs/blogs/tips/archive/2010/09/03/accessing-wmi-instances-directly.aspx

If you knowWMIInstance path, you can directlyWMIConverts a path string toWMIObject.

[WMI] 'win32 _ service. Name = "w32time "'

[WMI] 'win32 _ logicaldisk = "C :"'

You can also specify a completeWMIPath, including the machine Name:

[WMI] '\ server5 \ Root \ cimv2: win32_service.name = "w32time "'

 

 

 

 

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