Cause a UAC popup from commandline without custom tools

Solution 1:

You can use the Start-Process cmdlet in Powershell with the RunAs verb. More here: http://technet.microsoft.com/en-us/library/dd347667.aspx

Solution 2:

Simply run the cmd.exe as administrator.

The keyboard shortcut for this is [shift] + [enter] after you have selected the commandline from the start menu. A UAC window should pop up.

OR

Run everything as Admin

Not recommended for everyday usage, but there is also a built in administrator account that you can activate in windows that will simply run any and all applications as root. In an administrative cmd:

net user administrator /active:yes

Change that to '/active:no' if you want to disable the account. A brief intro here.