using powershell to set folder permission recursively for a user

We can use icacls to set folder permission for a user by using the following command. The /t option does this for folder and subfolders (recursive) 

icacls "C:\Path\To\Your\Folder" /grant "Username:(OI)(CI)(M)" /T


Another option would be to use:

$folder = "C:\MyFolder"
$acl = Get-Acl $folder
$rule = New-Object System.Security.AccessControl.FileSystemAccessRule("JohnDoe", "Modify", 
"ContainerInherit, ObjectInherit", "None", "Allow")
$acl.SetAccessRule($rule)

# Apply recursively
Get-ChildItem -Path $folder -Recurse | ForEach-Object {
    $itemAcl = Get-Acl $_.FullName
    $itemAcl.SetAccessRule($rule)
    Set-Acl -Path $_.FullName -AclObject $itemAcl
}