How to execute a ruby command stored in a variable in powershell

I am executing a command of the form rake
drive:unit_tests:load_data parameters here'. I get the erroris not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.`
I used the code in my ps1 file
$dat1 = one ruby command | Out-String
# $dat1 will contain the value - rake drive:unit_tests:load_data
$dat2 = " parameters here"
$dat3 = $dat1 + $dat2
& $dat3

Hiho,
try running this from the directory you installed Ruby into (or set the location to that directory before that step).
Cheers,
Fred
There's no place like 127.0.0.1
Thanks. I'll try that link now. But, I 'd like to know why the command works when I copy paste / type it, but not when I store it in a variable and then execute it.
When you copy/paste or type it into the console command line, the parser is interpreting it in
Command Parsing Mode.
When you read it back from a variable, the parser is interpreting it in
Expression Parsing Mode.
This article by Keith Hill explains more about the differences:
http://rkeithhill.wordpress.com/2007/11/24/effective-powershell-item-10-understanding-powershell-parsing-modes/
[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

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