Hi there,

Why my .ps1 script like below:
     Write-host Test space and arguments: $args[0].

Gives me result:
Test space and arguments: ball .

When I call it as:
   .\test.ps1 ball


Why there is additional space after "ball" ??

I don't use write-host anymore (I had a hard time predicting out put from time to time).  I'm using PowerShell v2 RTM.  Not sure how this works on v1.  But when I want to write to the console I just put what I want in between double-quotes.  So all Test.ps1 needs to have is the following (including the double-quotes):

"Test space and arguments: $($args[0])."

.\test.ps1 ball

Should produce what you want at the console.  If you want the output printed to a file you could do:

"Test space and arguments: $($args[0])." > filename.txt

The greater-than sign redirects the output to the file.

Now a bit of explanation:
You can use either single-quotes or double-quotes when specifying a string.  However, double-quotes resolve variables.
For example:
$name = "Spot"
$Sentence = "See $name run."

This produces
See Spot run.

If, instead, you used single-quotes for the $Sentence variable:
$Sentence = 'See $name run.'

The output would be
See $name run.

Sometimes you want to access a noteproperty or even a statement that returns a string in a string:
$Pet.breed = 'Terrier'
$Pet.name = 'Spot'
you could access these noteproperties but not "straight up"
If you typed
"$Pet.name is a $Pet.breed"
it would return
@{breed=Terrier; name=Spot}.name is a @{breed=Terrier; name=Spot}.breed

To actually get the value you need to put the variable inside parentheses like so...

"$($Pet.name) is a $($Pet.breed)"

Anything inside $() will be resolved for example:

"$($Pet.name) ran a race on $(get-date -f MM/dd/yyyy)."

Would produce:
Spot ran a race on 03/15/2010.

Also anything in quotations on it' own line will be output to the console.  So you don't have to write-host to output to the console.

Many thanks to you Cameron. The difference between double quota and singles were the answer. So this was enough:
"Test space and arguments: $args[0]."

--
Petri