Auto pull all git repos that reside within a parent directory. (For those of us who are repo hoarders).

UpdateRepos.ps1

#!/usr/bin/env pwsh

<#
  .NOTES
  ===========================================================
   Created on:   03/26/2021
   Created by:   instance.id
   Platform:     Linux/Windows
   Filename:     updaterepos.ps1
   PSVersion:    7.2-preview4
  ===========================================================
  .DESCRIPTION
    Iterate your GitHub folder and pull any that are behind
    I am sure this could use some additional logic, 
    but it does what I needed/wanted it to do
  .PARAMETER Path
    The path to the parent folder which contains your repos
#>

Param (
    [Parameter(ValueFromPipeline = $true)][string]$Path = $(Get-Location)
)

# -- Add repositories you wish to skip to this array.
$exclusions = @('instance-id') 

$location = $Path
[Int32]$gitFolders = 0
[Int32]$parentDirectories = 0
$directories = New-Object 'System.Collections.Generic.List[PSCustomObject]'

# -------------------------------------------- Program Execution
# --------------------------------------------------------------
Set-Location $location

Write-Progress -Activity 'Ensuring git repositories' -PercentComplete 0 -CurrentOperation 'Initialization'

foreach ($directory in [System.IO.Directory]::EnumerateDirectories($location, '*.*', 'TopDirectoryOnly')) {
    try { $folderObject = Get-Item $directory -ErrorAction SilentlyContinue } catch [UnauthorizedAccessException] {}
    $parentDirectories++

    if ( $exclusions.Contains($folderObject.BaseName) ) { Write-Host "SKIPPING: ${directory}"; Continue }

    foreach ($subDirectory in [System.IO.Directory]::EnumerateDirectories($directory, '.git')) {
        try { $subfolderObject = Get-Item $subDirectory -ErrorAction SilentlyContinue } catch [UnauthorizedAccessException] {}
        $directories.Add([PSCustomObject]@{Parent = $directory; Name = $folderObject.BaseName; SubDir = $subDirectory })
        $gitFolders++
    }
}

$updates = New-Object 'System.Collections.Generic.List[PSCustomObject]'
$updateNum = 0

$directories = $directories | Sort-Object -Property Parent

for ($i = 0; $i -lt $directories.Count; $i++) {
    $pct = ($i + 1) / $directories.Count * 100
    $dirName = $directories[$i].Name
    $current = $directories[$i].Parent

    Set-Location $current
    Write-Progress -Activity "Updating: ${dirName}" -PercentComplete $pct -CurrentOperation 'Fetching...'
    git fetch >$null

    Write-Progress -Activity "Updating: ${dirName}" -PercentComplete $pct -CurrentOperation 'Status Check...'
    $status = git status -sb --porcelain=v2 | Out-String
    $status -match 'branch.ab \+(?<ahead>\d+) -(?<behind>\d+)' >$null 2>&1
    if ($Matches.Ahead -gt 0) { Continue }
    if ($Matches.behind -gt 0) { 
        Write-Progress -Activity "Updating: ${dirName}" -PercentComplete $pct -CurrentOperation 'Pulling...'
        git pull; $updateNum++; $updates += $directories[$i];
    }    
}

Set-Location $location

Write-Host "Updated ${updateNum} repos. See Updated repos here: ${location}/$($([IO.FileInfo]$location).BaseName)_updated.txt"
Write-Output $updates | Sort-Object -Property Parent | Format-Table -auto | Out-File -Width 999 -FilePath .\$($([IO.FileInfo]$location).BaseName)_updated.txt