I want to store just the value of a PowerShell object in a variable.
Example
If we run:
$time = Get-Process System | select TotalProcessorTime
$time
This is the current output:
TotalProcessorTime
------------------
00:03:22.8281250
This is the output I would like:
00:03:22.8281250
Discussion
How do we store just the value? If we run $time | Get-Member, we see that PowerShell has stored a Selected.System.Diagnostics.Process that has the following properties:
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
TotalProcessorTime NoteProperty System.TimeSpan TotalProcessorTime=00:03:22.8281250
I have tried getting the value by running both $time.TotalProcessorTime and $time.ToString() without success.
The Object which produces that string "00:03:22.8281250":
(Get-Process System).TotalProcessorTime
The string itself:
(Get-Process System).TotalProcessorTime.ToString()
Related
I'm trying to figure out how to grab the value associated with AzureWebJobsStorage variable from a Object[] in powershell. Here's the logic so far:
$azAppSettingsOutput = az functionapp config appsettings list --name somename --resource-group myResource --subscription subscription | ConvertFrom-Json
Write-Output $azAppSettingsOutput.GetType().name
Write-Output $azAppSettingsOutput | Get-Member
Write-Output $azAppSettingsOutput.name
This is the output I see:
PS C:\Users\me> .\test.ps1
Object[]
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
name NoteProperty string name=APPINSIGHTS_INSTRUMENTATIONKEY
slotSetting NoteProperty bool slotSetting=False
value NoteProperty string value=asdfasdf-asdf-asdf-asdf-asdf-asdf
APPINSIGHTS_INSTRUMENTATIONKEY
AzureWebJobsStorage
FUNCTIONS_EXTENSION_VERSION
FUNCTIONS_WORKER_RUNTIME
WEBSITE_RUN_FROM_PACKAGE
StorageTableName
PS C:\Users\me\>
I know I can loop through like this:
foreach($setting in $azAppSettingsOutput) {
Write-Output $setting.name
$value = $setting.value
And then I can add an if statement to check if the name matches "AzureWebJobsStorage" but just wondering if there's a simpler way.
Thanks.
Use the Where-Object cmdlet to filter your data:
$azAppSettingsOutput |Where-Object name -eq 'AzureWebJobsStorage'
This will filter out any objects except for those where the name property equals "AzureWebJobsStorage"
I would have expected to get the same "type" from both of the following commands. The second prepends the type name with "Selected."
>(Get-CimInstance CIM_LogicalDisk).CimClass | gm
TypeName: Microsoft.Management.Infrastructure.CimClass
Name MemberType Definition
---- ---------- ----------
Dispose Method void Dispose(), void IDisposable.Dispose()
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
CimClassMethods Property Microsoft.Management.Infrastructure.Generic.CimReadOnlyKeyedCollection[Microsoft.M
CimClassProperties Property Microsoft.Management.Infrastructure.Generic.CimReadOnlyKeyedCollection[Microsoft.M
CimClassQualifiers Property Microsoft.Management.Infrastructure.Generic.CimReadOnlyKeyedCollection[Microsoft.M
CimSuperClass Property cimclass CimSuperClass {get;}
CimSuperClassName Property string CimSuperClassName {get;}
CimSystemProperties Property Microsoft.Management.Infrastructure.CimSystemProperties CimSystemProperties {get;}
CimClassName ScriptProperty System.String CimClassName {get=[OutputType([string])]...
The second reveals a different type.
>Get-CimInstance CIM_LogicalDisk | Select-Object -Property CimClass | gm
TypeName: Selected.Microsoft.Management.Infrastructure.CimInstance
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
CimClass NoteProperty cimclass CimClass=root/cimv2:Win32_MappedLogicalDisk
>$PSVersionTable.PSVersion.ToString()
5.1.14409.1018
Using Select-Object with the -Property parameter outputs an object with the selected properties.
To get a "bare" property value, use the -ExpandProperty parameter instead.
Get-CimInstance CIM_LogicalDisk | Select-Object -ExpandProperty CimClass | gm
Why does Sort-Object produce different objects when -Descending is used? The NoteProperty members are not the same.
Also, when writing to the console, the Name property does not appear unless -Descending is used. Why is that?
C:>Get-Type | Select-Object -Property BaseType,Name | gm
TypeName: Selected.System.RuntimeType
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
BaseType NoteProperty RuntimeType BaseType=System.Object
Name NoteProperty string Name=Registry
C:>Get-Type | Select-Object -Property BaseType,Name | Sort-Object -Property BaseType,Name | gm
TypeName: Selected.System.RuntimeType
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
BaseType NoteProperty object BaseType=null
Name NoteProperty string Name=_Activator
C:>Get-Type | Select-Object -Property BaseType,Name | Sort-Object -Property BaseType,Name -Descending | gm
TypeName: Selected.System.RuntimeType
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
BaseType NoteProperty RuntimeType BaseType=System.Xml.Xsl.XsltException
Name NoteProperty string Name=XsltCompileException
My apologies for not including information about Get-Type. https://gallery.technet.microsoft.com/scriptcenter/Get-Type-Get-exported-fee19cf7
This is not a cmdlet that is natively part of PoSH. It's either something the OP wrote or got from another source. If from another source than the OP should reach out to that author to ask what is to be expected.
If you do this same things using a built-in cmdlet, say Get-Date, we see all members are the same.
Get-Date |
Select-Object -Property BaseType,Name |
Sort-Object -Property BaseType, Name |
Get-Member
TypeName: Selected.System.DateTime
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
BaseType NoteProperty object BaseType=null
Name NoteProperty object Name=null
Get-Date | Select-Object -Property BaseType,Name |
Sort-Object -Property BaseType, Name -Descending |
Get-Member
TypeName: Selected.System.DateTime
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
BaseType NoteProperty object BaseType=null
Name NoteProperty object Name=null
So, would seem to point specifically to the implementation of this cmdlet the OP is looking for clarity on.
It is possible that your GetType invocation results in an array starting with $null as it has a try-catch block providing an error value of $null. Then, should any parameters be passed to the Get-Type, that null would be filtered out, but you pass none, so null is still present in the output. Then, as the result is piped to Select-Object, only the first object in the pipe is parsed to check if all the columns are present to display, and should the null be the first object, it has no properties thus nothing gets displayed.
To fix, add the | Where-Object {$_ -ne $null} into the Get-Type.ps1 script right before | Where-Object -FilterScript $WhereBlock in the last significant line. This will filter out any nulls produced by previous try-catch block, and you will only get an array of objects that have values.
I am setting the variable 'a' like this:
$a=dir -recurse c:\temp
If I now examine this object with 'get-member' like this:
$a|get-member
I get back the type, but also all the methods and other properties like this:
TypeName: System.IO.FileInfo
Name MemberType Definition
---- ---------- ----------
Mode CodeProperty System.String Mode{get=Mode;}
AppendText Method System.IO.StreamWriter AppendText()
CopyTo Method System.IO.FileInfo CopyTo(string destFileName), System.IO.FileInfo CopyTo(string destFileName, bool...
[...]
Which is nice; but sometimes I just want to get hold of the type (I'll look up whatever it does afterwards).
So I tried this:
$a|get-member|select-object -Property typename
The output suprised me initially: because what you get back is the typename for each individual item in the collection- and the types (although clearly related) are not identical:
TypeName
--------
System.IO.DirectoryInfo
System.IO.DirectoryInfo
System.IO.DirectoryInfo
[...]
System.IO.FileInfo
[...]
Then I thought about this; and it sort of made sense - this is a collection of Objects that I'm piping through the Object-Pipeline; but then it made me think:
What was 'Get-Member' actually telling me previously ? When it said the type was 'System.IO.FileInfo' - but actually the collection contains a mixture of object types ?
Whatever it is 'Get-Member' is displaying - how do I get at that exact thing ?
I can almost (sort-of, but actually its just wrong) get what I thought I was initially after with this:
$a|get-member|select-object -Property typename -first 1
But this just peeks at the 'first' object; and in fact gives me a different answer to what 'Get-Member' output for me.
So what is the 'TypeName' that 'Get-Member' is showing- and where is that stored ?
Is the value of 'dir' (Get-ChildItem against a filepath) simply a collection of objects, or is it a parent object (with its own set of 'scalar' properties) and a single property referencing a collection of associated objects ?
That's a lot of questions in one, let's see if we can make some sense of this.
The TypeName that Get-Member displays for each distinct type of object (we'll get back to that), comes from a hidden property that all objects in PowerShell carry, called pstypenames:
PS C:\> $something = 1
PS C:\> $something.pstypenames
System.Int32
System.ValueType
System.Object
PS C:\>
So, pstypenames is an ordered list of all the types in that objects type hierarchy. If we change the value of pstypenames, you'll see that reflected in the output from Get-Member:
PS C:\> $something.pstypenames.Insert(0,"MonoJohnny.CustomTypeName")
PS C:\> Get-Member -InputObject $something
TypeName: MonoJohnny.CustomTypeName
Name MemberType Definition
---- ---------- ----------
...
So, if you want the TypeName for an object, as displayed by Get-Member, you can always do:
$something.pstypenames[0]
As shown above, this value can be manipulated, so if you want the true type of an object at runtime, use the GetType() method:
$something.GetType().FullName
The reason that Get-Member only shows you the entire list of properties for a System.IO.FileInfo object once is that it (rightly so) assumes that all other objects of type System.IO.FileInfo will have the exact same members - no need to duplicate that output.
I you have multiple distinct types in a collection and pipe those to Get-Member, it'll only show you the members for the first object it encounters with a unique type name (remember, the value of pstypenames[0]). This is the case when you pipe Get-ChildItem to Get-Member, since Get-ChildItem on the filesystem provider only returns two different types of objects - FileInfo objects and DirectoryInfo objects.
For builtin types this is totally fine, but with custom objects that you create in PowerShell, this can be quite annoying.
Consider the following example:
PS C:\> $Object1 = New-Object psobject -Property #{ Prop1 = 1 }
PS C:\> $Object2 = New-Object psobject -Property #{ Prop2 = 2 }
Now, $Object1 and $Object2 are clearly 2 different kinds of objects - they have different property names. But what happens when we pipe them to Get-Member in the same pipeline:
PS C:\> $Object1,$Object2 |Get-Member
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
Prop1 NoteProperty System.Int32 Prop1=1
Since the underlying type of both objects are System.Management.Automation.PSObject, the value of pstypenames is also the same for both, and Get-Member can't distinguish between the two.
Now, all of a sudden, the ability to manipulate pstypenames without actually fiddling with the type system comes in handy:
PS C:\> $Object1.pstypenames.Insert(0,"ObjectType1")
PS C:\> $Object2.pstypenames.Insert(0,"ObjectType2")
PS C:\> $Object1,$Object2 |Get-Member
TypeName: ObjectType1
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
Prop1 NoteProperty System.Int32 Prop1=1
TypeName: ObjectType2
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
Prop2 NoteProperty System.Int32 Prop2=2
Sweet!
You can also inject a custom type name during object creation by specifying PSTypeName as a string property:
PS C:\> $Object1 = New-Object psobject -Property #{ Prop1 = 1; PSTypeName = 'ObjectType1' }
PS C:\> $Object2 = New-Object psobject -Property #{ Prop2 = 2; PSTypeName = 'ObjectType2' }
I have (yet another) powershell query. I have an array in powershell which i need to use the remove() and split commands on.
Normally you set an array (or variable) and the above methods exist. On the below $csv2 array both methods are missing, i have checked using the get-member cmd.
How can i go about using remove to get rid of lines with nan. Also how do i split the columns into two different variables. at the moment each element of the array displays one line, for each line i need to convert it into two variables, one for each column.
timestamp Utilization
--------- -----------
1276505880 2.0763250000e+00
1276505890 1.7487730000e+00
1276505900 1.6906890000e+00
1276505910 1.7972880000e+00
1276505920 1.8141900000e+00
1276505930 nan
1276505940 nan
1276505950 0.0000000000e+00
$SystemStats = (Get-F5.iControl).SystemStatistics
$report = "c:\snmp\data" + $gObj + ".csv"
### Allocate a new Query Object and add the inputs needed
$Query = New-Object -TypeName iControl.SystemStatisticsPerformanceStatisticQuery
$Query.object_name = $i
$Query.start_time = $startTime
$Query.end_time = 0
$Query.interval = $interval
$Query.maximum_rows = 0
### Make method call passing in an array of size one with the specified query
$ReportData = $SystemStats.get_performance_graph_csv_statistics( (,$Query) )
### Allocate a new encoder and turn the byte array into a string
$ASCII = New-Object -TypeName System.Text.ASCIIEncoding
$csvdata = $ASCII.GetString($ReportData[0].statistic_data)
$csv2 = convertFrom-CSV $csvdata
$csv2
There is no Remove or Split method on .NET's Array type, or added by the PowerShell wrapper around an Array instance. This is quite easy to show:
PS[64bit] E:\> $a = 1,2,3,4,5
PS[64bit] E:\> $a.GetType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
PS[64bit] E:\> Get-Member -InputObject $a
TypeName: System.Object[]
Name MemberType Definition
---- ---------- ----------
Count AliasProperty Count = Length
Address Method System.Object&, mscorlib, Version=2.0.0.0, Culture=neutral, PublicK...
Clone Method System.Object Clone()
CopyTo Method System.Void CopyTo(array array, int index), System.Void CopyTo(arra...
Equals Method bool Equals(System.Object obj)
Get Method System.Object Get(int )
GetEnumerator Method System.Collections.IEnumerator GetEnumerator()
GetHashCode Method int GetHashCode()
GetLength Method int GetLength(int dimension)
GetLongLength Method long GetLongLength(int dimension)
GetLowerBound Method int GetLowerBound(int dimension)
GetType Method type GetType()
GetUpperBound Method int GetUpperBound(int dimension)
GetValue Method System.Object GetValue(Params int[] indices), System.Object GetValu...
Initialize Method System.Void Initialize()
Set Method System.Void Set(int , System.Object )
SetValue Method System.Void SetValue(System.Object value, int index), System.Void S...
ToString Method string ToString()
IsFixedSize Property System.Boolean IsFixedSize {get;}
IsReadOnly Property System.Boolean IsReadOnly {get;}
IsSynchronized Property System.Boolean IsSynchronized {get;}
Length Property System.Int32 Length {get;}
LongLength Property System.Int64 LongLength {get;}
Rank Property System.Int32 Rank {get;}
Arrays in .NET, and PowerShell, are fixed size. To remove an element you need to copy all but the element to be removed, in PSH this can be done with Where-Object:
$newArray = $oldArray | Where-Object {some-condition-on-$_}
Similarly Select-Object with -First and -Skip parameters can be used to select elements before or after (resp3ectively) an index.
NB System.Array does implement System.Collections.ILst but the explicit implementation of IList.Remove just throws a NotImplementedException.