Powershell script to remove a directory from the PATH on Windows (for either System or User) with optional 'Dry Run' mode

remove_from_path.ps1

# Powershell script to remove a directory from the PATH on Windows for either System or User
# Can optionally run it in dry run mode to be certain it's going to do what you require
#
# Specify the target (User or Machine), dry run mode, and directory to remove
# Examples
#  .\remove_from_path.ps1 -DirectoryToRemove "C:\Path\To\Directory"
# This will remove C:\Path\To\Directory from the user PATH.
# 
# .\remove_from_path.ps1 -DirectoryToRemove "C:\Path\To\Directory" -Target Machine
# This will remove C:\Path\To\Directory from the system PATH.
# 
# You can also specify the DryRun parameter to see what changes the script would make without actually making them:
# .\remove_from_path.ps1 -DirectoryToRemove "C:\Path\To\Directory" -DryRun true
# 

param(
    [Parameter(Mandatory=$false)]
    [ValidateSet("User", "Machine")]
    [string]$Target = "User",

    [Parameter(Mandatory=$false)]
    [ValidateSet("true", "false")]
    [string]$DryRun = "false",

    [Parameter(Mandatory=$true)]
    [string]$DirectoryToRemove
)

# Get the current PATH
$path = [Environment]::GetEnvironmentVariable('Path', $Target)

# Split the PATH into an array of directories
$directories = $path -split ';'

# Check if the directory to remove is in the PATH
if ($DirectoryToRemove -in $directories) {
    # Remove the directory from the array
    $newDirectories = $directories -ne $DirectoryToRemove

    if ($DryRun -eq "true") {
        # Dry run: show what would be done
        Write-Host "Dry Run: would remove $DirectoryToRemove from the $Target PATH."
        Write-Host "New PATH would be: `n$(($newDirectories -join ';'))"
    } else {
        # Set the new PATH
        [Environment]::SetEnvironmentVariable('Path', ($newDirectories -join ';'), $Target)
        Write-Host "$DirectoryToRemove removed from the $Target PATH."
    }
} else {
    Write-Host "$DirectoryToRemove is not in the $Target PATH."
}

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