These include the large middle-class suburbs of Peoria, Mesa, Chandler, and Glendale; upscale Scottsdale; and the college area of Tempe which serves as home to Arizona State University. All areas are modern and generally lacking in historic interest, but keep in mind that Phoenix only had 100,000 residents in 1950.
do {} until ($false) is an infinite loop; it'll only exit if you use something like break, return or throw from inside the loop body. do { } until ($true) would execute the loop body exactly once (which would make the loop rather pointless.) It looks like what you intended to do was wait for a file to exist.
The ampersand (the 'and' sign) here tells PowerShell to execute that command, instead of treating it as a cmdlet or a string. The backticks (the funny looking single-quotes) are there to escape the following character, similar to the \ in C-based languages, or double-double-quotes () in VB.ow to do it the PowerShell way. Remember that PowerShell is a shell first and foremost. To run the above external command, just do the following: Notice that I'm not putting all the arguments into a single string, I'm just writing them as they are.