The script is tailing Sitecore log files to the attached console. It is meant to be used within an entry point in Docker container.

TailSitecoreLogs.ps1

<#
    .SYNOPSIS
        Tails Sitecore logs to Docker console (STDOUT).

    .PARAMETER LogsFolder
        Path to a folder where Sitecore logs are located.

    .PARAMETER Filter
        Log file name filter. Can contain wildcards "*".

    .PARAMETER FileEndMarker
        Marker of the end of the file.
#>

[CmdletBinding()]
param(
    [Parameter(Mandatory = $false)]
    [ValidateNotNullOrEmpty()] 
    [string]$LogsFolder = "$env:SITEPATH\App_Data\logs"
    ,
    [Parameter(Mandatory = $false)]
    [ValidateNotNullOrEmpty()] 
    [string]$Filter = "log.*.txt"
    ,
    [Parameter(Mandatory = $false)]
    [ValidateNotNullOrEmpty()] 
    [string]$FileEndMarker = "------END------"
)

$now = Get-Date;

If(!(Test-Path $LogsFolder))
{
	# This is the first time Sitecore starts up
	Write-Host ("### Logs folder not found => creating an empty folder $LogsFolder...");
	New-Item -ItemType Directory -Force -Path $LogsFolder
}

while($true) 
{ 
	Start-Sleep -Milliseconds 1000;
	$latestLog = Get-ChildItem -Path $LogsFolder | Where-Object {$_.Name -like $Filter} | Sort-Object Name -Descending | Select-Object -First 1;

	# Wait while new log file created, ignore old log files
	if (-not $latestLog -or $latestLog.LastWriteTime -lt $now)
	{
		continue;
	}

	$lastLine = Get-Content -Tail 1 $latestLog.FullName;
	
	if ($lastLine -Match $FileEndMarker)
	{
		continue;
	}
	
	Write-Host ("### Tailing $latestLog...");
	Get-Content $latestLog.FullName -Wait | ForEach-Object {$_ ; if($_ -Match $FileEndMarker){continue} };
}