run powershell command from cmd

powershell -command "get-process | ? {$_.Description -eq 'Sysinter Process Explorer'} | select processname | out-file $env:APPDATA\example.txt"

basically you have a powershell command and paste it in between these quotes to call it from CMD

powershell -command " #PasteCodeHere "

inside these quotes you have to work with ' otherwise it will interrupt your command parameter.

Edit: Additional Information:

quite often you will encounter this: powershell -command "& 'somestuff'"

the & is used to call a File. when you're only using a command & is unnessecary, when you want to call a script, you should use it.

powershell -command "& 'C:\foobar.ps1'"

You could also use powershell -file C:\file.ps1 to call a script