Write Output to the Screen and to File

Write-Tee.ps1

function Write-Tee
{
    <#
    .SYNOPSIS
        Write output to the screen and to file simultaneously
    .DESCRIPTION
        Simply write your screen output to a file with automatic coloring based with special sytax between square brackets. Enable debugging and produce debugging only ouptut.
    .EXAMPLE
        Write-Tee "[=] This is the first task in my loop"
    .EXAMPLE
        Write-Tee @"
        Write a long message without a prefix and overwrite your log file
        "@ -NoPrefix -Overwrite
    .EXAMPLE
        Write-Tee "[?] Collect info without a line break" -NoNewLine; Read-Host
    .LINK
        https://automation.haus/powershell-write-host-console-log-file
    #>
    [cmdletbinding()]
    param
    (
        [Parameter(Position=0,ValueFromPipeline=$true)]
        [string]$msg,
        [string]$ForegroundColor = "White",
        [string]$OutFile=$LogFile,
        [switch]$Overwrite,
        [switch]$NoNewLine,
        [string]$Prefix="  - ",
        [switch]$NoPrefix
    )
    $Info = "i"; $Task = "="; $Errors = "!"; $Inquiry = "?"; $Debugging = "d"; $Response = "r"
    $DBG = $False
    switch -regex ($msg)
    {
        "\[$Info\]" { $ForegroundColor = "Yellow" }
        "\[$Task\]" { $ForegroundColor = "Cyan"; $Prefix = "  " }
        "\[$Errors\]" { $ForegroundColor = "Red" }
        "\[\$Inquiry\]" { $ForegroundColor = "Magenta" }
        "\[$Debugging\]" { $ForegroundColor = "Magenta"; $DBG = $True }
        "\[$Response\]" { if($ForegroundColor -eq "White"){ $ForegroundColor = "Green" } }
    }
    if(($DBG -eq $False) -or ($DBG -and $Debug)){ $Write = $True }
    if(!$NoPrefix)
    {
        if($Write){ Write-Host $Prefix -NoNewline }
    }
    if($NoNewLine)
    {
        if($Write){ Write-Host -ForegroundColor $ForegroundColor $msg -NoNewline }
    }
    else
    {
        if($Write){ Write-Host -ForegroundColor $ForegroundColor $msg }
    }
    if(!$NoPrefix -and $msg -ne ""){ $msg = $Prefix + $msg }
    if($OutFile -ne "")
    {
        if(!$Overwrite)
        {
            if($NoNewLine)
            {
                if($Write){ [System.IO.File]::AppendAllText($OutFile, $msg, [System.Text.Encoding]::Unicode) }
            }
            else
            {
                if($Write){ $msg | Out-File $OutFile -Append }
            }
        }
        else
        {
            if($Write){ $msg | Out-File $OutFile -Force }
        }
    }
}