awk-like BEGIN and END processing of a pipeline in PowerShell; adding -Verbose and -WhatIf support via CmdletBinding

Process-Pipeline.ps1

<#
.SYNOPSIS
    Process pipeline junk
.NOTES
    The mere presense of CmdletBinding() gives the -Verbose (-vb) parameter, so all Write-Verbose statement actually work.
    
    Adding SupportsShouldProcess=$true gives -WhatIf, and all things this function/script does that can affect the system get turned
    into verbose dry run ops.
#>
[CmdletBinding(SupportsShouldProcess=$True)]        # Attribute goes on 'param' keyword.
param(
    [Parameter( ValueFromPipeline=$true)]
    $InputObject
)
BEGIN {
    Write-Verbose "BEGIN"
}
PROCESS {
    Write-Verbose "PROCESS"
}
END {
    Write-Verbose "END"
}