Show notifications on Linux using PowerShell! Thanks to notify-send(1)

Invoke-PSNotification.ps1

function Invoke-PSNotification {
    [CmdletBinding(SupportsShouldProcess, ConfirmImpact = 'Medium')]
    param(
        [Parameter(Position=0, Mandatory, ValueFromPipeline)]
        [object[]]
        $Body,

        [string]
        $Summary = 'PowerShell Notification',

        [ValidateSet('Low', 'Normal', 'Critical')]
        [string]
        $Urgency,

        [int]
        $ExpireTime,

        [string[]]
        $Icon,

        [ValidateSet(
            "device","device.added","device.error","device.removed",
            "email","email.arrived","email.bounced", 
            "im","im.error","im.received",
            "network","network.connected","network.disconnected","network.error",
            "presence","presence.offline","presence.online",
            "transfer","transfer.complete","transfer.error" )]
        [string[]]
        $Category
    )
    begin {
        $notifySendArgs = [System.Collections.Generic.List[psobject]]@()

        if ($Urgency) {
            $notifySendArgs.Add("--urgency=$Urgency")
        }

        if ($ExpireTime) {
            $notifySendArgs.Add("--expire-time=$ExpireTime")
        }

        if ($Icon) {
            $notifySendArgs.Add("--icon=$($Icon -join ',')")
        }

        if ($Catagory) {
            $notifySendArgs.Add("--category=$($Category -join ',')")
        }

        $notifySendArgs.Add($Summary)
        $notifySendArgs.Add("")
    }

    process {
        $notifySendArgs[$notifySendArgs.Length - 1] = $Body
        if ($PSCmdlet.ShouldProcess('notify-send', "$($notifySendArgs -join ' ')")) {
            Start-Process -FilePath 'notify-send' -NoNewWindow -Wait -ArgumentList $notifySendArgs
        }
    }

    end {}
}