Powershell Script to Check if Windows Environment Paths ($env:PATH) are Valid and Exist

checkpaths.ps1

<#
MIT License

Copyright (c) 2025 Lucas Modrich

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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SOFTWARE.
#>

# Split the PATH environment variable into individual paths
$paths = $env:PATH -split ';'

# Initialize an array to store invalid paths
$invalidPaths = @()

# Iterate through each path in the PATH environment variable
foreach ($path in $paths) {
    try {
        # Check if the path is valid
        $isValid = Test-Path -Path $path -IsValid
        # Check if the path exists and is a directory
        $exists = Test-Path -Path $path -PathType Container
        
        # If the path is not valid or does not exist, add it to the invalidPaths array
        if (-not $isValid -or -not $exists) {
            $invalidPaths += [PSCustomObject]@{
                Path = $path
                IsValid = $isValid
                Exists = $exists
            }
        }
    } catch {
        # Output an error message if there is an issue checking the path
        Write-Host "Error checking path: $path"
    }
}

# Check if there are any invalid paths
if ($invalidPaths.Count -gt 0) {
    # Output a message indicating there are invalid paths and display them in a table
    Write-Host "The following paths in your PATH environment variable are invalid or do not exist:" -ForegroundColor Red
    $invalidPaths | Format-Table -AutoSize
} else {
    # Output a message indicating all paths are valid
    Write-Host "All paths in your PATH environment variable are valid and exist." -ForegroundColor Green
}