<#

.SYNOPSIS
    Gets the content of an INI file.

.DESCRIPTION
    Gets the content of an INI file and returns it as a hashtable.

.INPUTS
    System.String

.OUTPUTS
    System.Collections.Hashtable

.PARAMETER FilePath
    Specifies the path to the input INI file.

.EXAMPLE
    C:\PS>$IniContent = Get-IniContent -FilePath file.ini
    C:\PS>$IniContent['Section1'].Key1
    Gets the content of file.ini and access Key1 from Section1.

.LINK
    Out-IniFile

#>
function Get-IniContent
{
    [CmdletBinding()]
    Param
    (
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [ValidateScript({(Test-Path $_) -and ((Get-Item $_).Extension -eq ".ini")})]
        [System.String]$FilePath
    )

    # Initialize output hash table.
    $ini = @{}
    switch -regex -file $FilePath
    {
        "^\[(.+)\]$" # Section
        {
            $section = $matches[1]
            $ini[$section] = @{}
            $CommentCount = 0
        }
        "^(;.*)$" # Comment
        {
            if( !($section) )
            {
                $section = "No-Section"
                $ini[$section] = @{}
            }
            $value = $matches[1]
            $CommentCount = $CommentCount + 1
            $name = "Comment" + $CommentCount
            $ini[$section][$name] = $value
        } 
        "(.+?)\s*=\s*(.*)" # Key
        {
            if( !($section) )
            {
                $section = "No-Section"
                $ini[$section] = @{}
            }
            $name,$value = $matches[1..2]
            $ini[$section][$name] = $value
        }
    }
        
    return $ini
}

The above function documentation can be displayed by running Get-Help -Name Get-IniContent -Full:

Notice that the comment-based keywords starting with a . match the Get-Help result sections.

<#

.SYNOPSIS
    Reads a CSV file and filters it.

.DESCRIPTION
    The ReadUsersCsv.ps1 script reads a CSV file and filters it on the 'UserName' column.

.PARAMETER Path
    Specifies the path of the CSV input file.

.INPUTS
    None. You cannot pipe objects to ReadUsersCsv.ps1.

.OUTPUTS
    None. ReadUsersCsv.ps1 does not generate any output.

.EXAMPLE
    C:\PS> .\ReadUsersCsv.ps1 -Path C:\Temp\Users.csv -UserName j.doe

#>
Param
(
    [Parameter(Mandatory=$true,ValueFromPipeline=$false)]
    [System.String]
    $Path,
    [Parameter(Mandatory=$true,ValueFromPipeline=$false)]
    [System.String]
    $UserName
)

Import-Csv -Path $Path | Where-Object -FilterScript {$_.UserName -eq $UserName}

The above script documentation can be displayed by running Get-Help -Name ReadUsersCsv.ps1 -Full: