Can I override a Powershell native cmdlet but call it from my override - powershell

Question

In Javascript it is possible to do so, I think. In Powershell I'm not sure how to :
Let's say I want to override every call to write-host with my custom method but at some time I want to execute the native write-host inside my overide. Is it possible to store the native implentation under another name so as to call it later from new implementation ?
Update : it seems to me that the answer https://serverfault.com/a/642299/236470 does not fully answer the second part of my question. How do I store and call the native implementation ?

Answer 1

Calls to functions will override cmdlets. You can read more on this from about_Command_Precedence on TechNet ...
If you do not specify a path, Windows PowerShell uses the following
precedence order when it runs commands:
Alias
Function
Cmdlet
Native Windows commands
So simply making a function of the same name as a native cmdlet will get you what you want.
function Write-Host{
[cmdletbinding()]
param(
[Parameter(Mandatory,ValueFromPipeline)]
$string
)
Process {
# Executes once for each pipeline object
If ($string -match "bagels"){
Microsoft.PowerShell.Utility\Write-Host $string -ForegroundColor Green
}else{
Microsoft.PowerShell.Utility\Write-Host $string
}
}
}
So now write-host works with pipeline input that we can filter with. Calling the "real" cmdlet is as easy as specifying the module in the call. You can see I have done that twice in the above code sample. Some sample usage and output would be the following:
Be careful that you don't forget you have done this if you save it in a profile or something of that nature. Use Get-Command Write-Host whenever in doubt. In my case you can remove the override by calling Remove-Item function:write-host
You can also look into what are called proxy functions but I think that is overkill for what you intend to do.

Answer 2

Yes you can. I have an answer for that here on ServerFault, but since it's a different site I'll copy it since I can't close as duplicate to another site.
Yes, you can override Get-ChildItem or any other cmdlet in Powershell.
Name Your Function The Same
If you make a function with the same name in the same scope, yours will be used.
Example:
Function Get-ChildItem {
[CmdletBinding()]
param(
# Simulate the parameters here
)
# ... do stuff
}
Using Aliases
Create your own function, and then create an alias to that function, with the same name as the cmdlet you want to override.
Example:
Function My-GetChildItem {
[CmdletBinding()]
param(
# Simulate the parameters here
)
# ... do stuff
}
New-Alias -Name 'Get-ChildItem' -Value 'My-GetChildItem' -Scope Global
This way is nice because it's easier to test your function without
stomping on the built-in function, and you can control when the cmdlet
is overridden or not within your code.
To remove the alias:
Remove-Item 'Alias:\Get-ChildItem' -Force