Rename folder Docs to docs

docs/check-dns.md

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+*check-dns.ps1*
+================
+
+This PowerShell script measures the DNS resolution speed (using 100 popular domains) and prints it.
+
+Parameters
+----------
+```powershell
+PS> ./check-dns.ps1 [<CommonParameters>]
+
+[<CommonParameters>]
+    This script supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, WarningAction, 
+    WarningVariable, OutBuffer, PipelineVariable, and OutVariable.
+```
+
+Example
+-------
+```powershell
+PS> ./check-dns.ps1
+✅ DNS resolves 56.5 domains per second
+
+```
+
+Notes
+-----
+Author: Markus Fleschutz | License: CC0
+
+Related Links
+-------------
+https://github.com/fleschutz/PowerShell
+
+Script Content
+--------------
+```powershell
+<#
+.SYNOPSIS
+	Check the DNS resolution 
+.DESCRIPTION
+	This PowerShell script measures the DNS resolution speed (using 100 popular domains) and prints it.
+.EXAMPLE
+	PS> ./check-dns.ps1
+	✅ DNS resolves 56.5 domains per second
+.LINK
+	https://github.com/fleschutz/PowerShell
+.NOTES
+	Author: Markus Fleschutz | License: CC0
+#>
+ 
+try {
+	Write-Progress "⏳ Measuring DNS resolution..."
+	$table = Import-CSV "$PSScriptRoot/../Data/popular-domains.csv"
+	$numRows = $table.Length
+
+	$stopWatch = [system.diagnostics.stopwatch]::startNew()
+	if ($IsLinux) {
+		foreach($row in $table){$nop=dig $row.Domain +short}
+	} else {
+		foreach($row in $table){$nop=Resolve-DNSName $row.Domain}
+	}
+	[float]$elapsed = $stopWatch.Elapsed.TotalSeconds
+
+	Write-Progress -completed " "
+	$average = [math]::round($numRows / $elapsed, 1)
+	if ($average -lt 10.0) {
+		Write-Host "⚠️ DNS resolves $average domains per second only"
+	} else {  
+		Write-Host "✅ DNS resolves $average domains per second"
+	}
+	exit 0 # success
+} catch {
+	"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
+	exit 1
+}
+```
+
+*(generated by convert-ps2md.ps1 using the comment-based help of check-dns.ps1 as of 10/19/2023 08:11:35)*