对powershell.exe正确转义命令（从CMD.exe启动命令）

Question

How do I escape properly the below command? I need to run the powershell command from CMD because it's a stubpath value. The registry value for stubpath can't run powershell commands natively. The command is verified and works correctly. The problem is only to get it to run via powershell.exe -command "..."

powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "(Get-WmiObject -Class Win32_Printer | where-object { $_.Name -eq ("IPL" + ($env:COMPUTERNAME).Substring(1, 4)) }).SetDefaultPrinter()"

Right now it's breaking the line at "IPL" because of the double quotes. I think I have to escape the pipe has well.

Much appreciated!

Answer 1

you might try this

powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "& { (Get-WmiObject -Class Win32_Printer | where-object { $_.Name -eq (\"IPL\" + ($env:COMPUTERNAME).Substring(1, 4)) }).SetDefaultPrinter() }"

otherwise, what i like to do to avoid escaping anything is encode the command into base64, then use powershell -encodedcommand, like this

powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand KABHAGUAdAAtAFcAbQBpAE8AYgBqAGUAYwB0ACAALQBDAGwAYQBzAHMAIABXAGkAbgAzADIAXwBQAHIAaQBuAHQAZQByACAAfAAgAHcAaABlAHIAZQAtAG8AYgBqAGUAYwB0ACAAewAgACQAXwAuAE4AYQBtAGUAIAAtAGUAcQAgACgAIgBJAFAATAAiACAAKwAgACgAJABlAG4AdgA6AEMATwBNAFAAVQBUAEUAUgBOAEEATQBFACkALgBTAHUAYgBzAHQAcgBpAG4AZwAoADEALAAgADQAKQApACAAfQApAC4AUwBlAHQARABlAGYAYQB1AGwAdABQAHIAaQBuAHQAZQByACgAKQA=

here is a link to info on how to encode your commands. this even works for full, multi-line scripts

https://blogs.msdn.microsoft.com/timid/2014/03/26/powershell-encodedcommand-and-round-trips/

or you may be able to use this site to encode/decode

https://www.base64decode.org/

Answer 2

Found it, I'll leave this here since it can be useful for other users:

Original powershell command :

(Get-WmiObject -Class Win32_Printer | where-object { $_.Name -eq ("IPL" + ($env:COMPUTERNAME).Substring(1, 4)) }).SetDefaultPrinter()

To run from CMD.EXE, you have to escape the double quotes like this \\"IPL\\" instead of "IPL"

Working command:

powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "(Get-WmiObject -Class Win32_Printer | where-object { $_.Name -eq (\"IPL\" + ($env:COMPUTERNAME).Substring(1, 4)) }).SetDefaultPrinter()"