The Get-Help command tells you if a parameter accepts pipeline input or from remaining arguments.
You can also use Get-Command to inspect the attributes of a parameter.
First, let’s look at the properties of the Path parameter of the Remove-Item command.
(Get-Command Remove-Item).Parameters['Path']
From the output, you can see that the parameter belongs to the Path parameter set, accepts one or more strings, and doesn’t have any aliases.
Name : Path
ParameterType : System.String[]
ParameterSets : {[Path, System.Management.Automation.ParameterSetMetadata]}
IsDynamic : False
Aliases : {}
Attributes : {Path}
SwitchParameter : False
By inspecting the Attributes property, you can see that the Path parameter is mandatory and accepts values from the pipeline by value or property name.
(Get-Command Remove-Item).Parameters['Path'].Attributes
Position : 0
ParameterSetName : Path
Mandatory : True
ValueFromPipeline : True
ValueFromPipelineByPropertyName : True
ValueFromRemainingArguments : False
HelpMessage :
HelpMessageBaseName :
HelpMessageResourceId :
DontShow : False
TypeId : System.Management.Automation.ParameterAttribute
Next, let’s compare that to the LiteralPath parameter. This parameter belongs to the LiteralPath parameter set, accepts one or more strings, and has an alias of PSPath.
(Get-Command Remove-Item).Parameters['LiteralPath']
Name : LiteralPath
ParameterType : System.String[]
ParameterSets : {[LiteralPath, System.Management.Automation.ParameterSetMetadata]}
IsDynamic : False
Aliases : {PSPath}
Attributes : {LiteralPath, System.Management.Automation.AliasAttribute}
SwitchParameter : False
By inspecting the Attributes property, you can see that the LiteralPath parameter is mandatory and accepts values from the pipeline by property name.
(Get-Command Remove-Item).Parameters['LiteralPath'].Attributes
Position : -2147483648
ParameterSetName : LiteralPath
Mandatory : True
ValueFromPipeline : False
ValueFromPipelineByPropertyName : True
ValueFromRemainingArguments : False
HelpMessage :
HelpMessageBaseName :
HelpMessageResourceId :
DontShow : False
TypeId : System.Management.Automation.ParameterAttribute
AliasNames : {PSPath}
TypeId : System.Management.Automation.AliasAttribute