How do I write a PowerShell script that accepts pipeline input?

Question

I am trying to write a PowerShell script that can get pipeline input (and is expected to do so), but trying something like

ForEach-Object {
   # do something
}

doesn't actually work when using the script from the commandline as follows:

1..20 | .est.ps1

Is there a way?

Note: I know about functions and filters. This is not what I am looking for.

Answer 1

In v2 you can also accept pipeline input (by propertyName or byValue), add parameter aliases etc:

function Get-File{
    param(  
    [Parameter(
        Position=0, 
        Mandatory=$true, 
        ValueFromPipeline=$true,
        ValueFromPipelineByPropertyName=$true)
    ]
    [Alias('FullName')]
    [String[]]$FilePath
    ) 

    process {
       foreach($path in $FilePath)
       {
           Write-Host "file path is: $path"
       }
    }
}


# test ValueFromPipelineByPropertyName 
dir | Get-File

# test ValueFromPipeline (byValue) 

"D:scriptss1.txt","D:scriptss2.txt" | Get-File

 - or -

dir *.txt | foreach {$_.fullname} | Get-File