touch command in Powershell

gistfile1.ps1

# Type 'notepad $profile' to open your profile ps1 file and add
# This will add the file if it doesn't exist or update the 
# last write time if it does

# If you get some message about not being able to run scripts then you need to type the following command and restart powershell
# Set-ExecutionPolicy Bypass

Function touch {
    $file = $args[0]
    if($file -eq $null) {
        throw "No filename supplied"
    }

    if(Test-Path $file) {
        (Get-ChildItem $file).LastWriteTime = Get-Date
    }
    else {
        echo $null > $file
    }
}

change that echo to
New-Item -force -type file $file
that will create the entire path for the file if it does not exist, and it will be 0 in length as well just remove -force if you don't want auto directory creation