<#

.SYNOPSIS

Checks the swap space

.DESCRIPTION

This PowerShell script queries the current status of the swap space and prints it.

.PARAMETER minLevel

Specifies the minimum level in MB (10 MB by default)

.EXAMPLE

PS> ./check-swap-space.ps1

✅ Swap space uses 21% of 1GB - 1005MB free

.LINK

https://github.com/fleschutz/PowerShell

.NOTES

Author: Markus Fleschutz | License: CC0

#>

param([int]$minLevel = 10)

function MB2String { param([int64]$bytes)

if ($bytes -lt 1024) { return "$($bytes)MB" }

$bytes /= 1024

if ($bytes -lt 1024) { return "$($bytes)GB" }

$bytes /= 1024

if ($bytes -lt 1024) { return "$($bytes)TB" }

$bytes /= 1024

if ($bytes -lt 1024) { return "$($bytes)PB" }

$bytes /= 1024

if ($bytes -lt 1024) { return "$($bytes)EB" }

}

try {

if ($IsLinux) {

$Result = $(free --mega | grep Swap:)

[int64]$total = $Result.subString(5,14)

[int64]$used = $Result.substring(20,13)

[int64]$free = $Result.substring(32,11)

} else {

$items = Get-WmiObject -class "Win32_PageFileUsage" -namespace "root\CIMV2" -computername localhost

[int64]$total = [int64]$used = 0

foreach ($item in $items) {

$total += $item.AllocatedBaseSize

$used += $item.CurrentUsage

}

[int64]$free = ($total - $used)

}

if ($total -eq 0) {

Write-Output "⚠️ No swap space configured"

} elseif ($free -eq 0) {

Write-Output "⚠️ Swap space is full ($(MB2String $total))"

} elseif ($free -lt $minLevel) {

Write-Output "⚠️ Swap space has only $(MB2String $free) of $(MB2String $total) left"

} elseif ($used -lt 3) {

Write-Output "✅ Swap space unused - $(MB2String $free) available"

} else {

[int64]$percent = ($free * 100) / $total

Write-Output "✅ Swap space has $(MB2String $free) of $(MB2String $total) left ($percent%)"

}

exit 0 # success

} catch {

"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"

exit 1

}