Perform various IIS App Pool tasks via PowerShell

AppPoolTasks.ps1

#---- Recycles all application pools on the given computer ----#
function RecyclePool {
    [CmdletBinding()]
    param (
        [string[]]$ComputerName,
        [pscredential]$Credential
    )

    process {
        foreach ($server in $ComputerName) {
            Invoke-Command $server -Credential $Credential {
                Import-Module WebAdministration
                $apps = Get-ChildItem iis:\apppools
                foreach ($app in $apps) {
                    Restart-WebAppPool $app.name
                }
                [PSCustomObject]@{
                    Hostname = $env:COMPUTERNAME
                    AppPools = [string]$apps.Name
                }
            }
        } 
    }
}

#---- Get the current stat of all application pools on the given computer ----#
function GetAppPoolState {
    [CmdletBinding()]
    param (
        [string[]]$ComputerName,
        [pscredential]$Credential
    )
    
    process {
        foreach ($server in $servers.hostname) {
            Invoke-Command $server -Credential $cred {
                Import-Module webadministration
                $apps = Get-ChildItem iis:\apppools
                foreach ($app in $apps) {
                    [PSCustomObject]@{
                        Hostname = $env:COMPUTERNAME
                        AppPools = $app.Name
                        State = $app.State
                    }
                }
            }
        }
    }
}

#---- Start all stopped application pools ----#
function StartAppPool {
    [CmdletBinding()]
    param (
        [string[]]$ComputerName,
        [pscredential]$Credential
    )
    
    process {
        foreach ($server in $servers.hostname) {
            Invoke-Command $server -Credential $cred {
                Import-Module webadministration
                $apps = Get-ChildItem iis:\apppools
                foreach ($app in $apps) {
                    if ($app.State -eq "Stopped") {
                        $app | Start-WebAppPool
                        [PSCustomObject]@{
                            Hostname = $env:COMPUTERNAME
                            AppPools = $app.Name
                        }   
                    }
                }
            }
        }
    }
}