PortValhalla/scripts/lib/SoftwareManagement.ps1

<#
    .SYNOPSIS
    Checks whether a command with the specified name exists.

    .PARAMETER Name
    The name of the command to check.
#>
function Test-Command {
    param (
        [string] $Name
    )

    [bool] (Get-Command $Name -ErrorAction SilentlyContinue);
}

<#
    .SYNOPSIS
    Checks whether a package with the specified name is installed.

    .PARAMETER Name
    The name of the package to check.
#>
function Test-PSPackage {
    param(
        [string] $Name
    )

    [bool] (Get-Package $Name -ErrorAction SilentlyContinue);
}

<#
    .SYNOPSIS
    Checks whether a module with the specified name is installed.

    .PARAMETER Name
    The name of the module to check.
#>
function Test-PSModule {
    param(
        [string] $Name
    )

    [bool](Get-Module -ListAvailable $Name -ErrorAction SilentlyContinue);
}