Powershell Coding - Path and Variable Issues

Question

Hello, I am working with a powershell program to copy a file off of my flash drive and into the startup file of what ever user is logged onto that computer. 
My code is
powershell -command { }; $a=[Environment]::UserName ; $c='E:\Other\Programs\program2.bat' ; $b='C:/Users/$a/AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup' ; copy $c $b ; start-sleep 30
 It just uses the $a instead of the variable name...  if I change it to " " it says that the path cannot be found a cmd or operable program. and it stops at Windows/Start 
can anyone help me out with this?
For anyone wondering why I am using powershell -command  instead of ISE is because I am running it from a .bat file because the execution policy is set to restricted AND CANNOT BE CHANGED.

Answer 1

Try
$b="\"C:/Users/$a/AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup\"";
You must use double quotes for Powershell to use the value of $a - See:
https://technet.microsoft.com/en-us/library/hh847740.aspx
and you need an extra set of quotes escaped with a backslash to cope with the space in "Start Menu" - See:
http://www.tinyint.com/index.php/2011/04/20/escaping-quotes-in-powershell-exe-command-via-command-prompt/
In future (or if this is not working for you) please direct questions about Powershell to this forum
https://social.technet.microsoft.com/Forums/scriptcenter/en-US/home?forum=ITCG