Weird string expansion with powershell -

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i'm using string expansion feature build filenames, , don't quite understand what's going on.

consider:

  $basename = "base" [int]$count = 1 $ext = ".ext"  $filename = "$basename$count$ext" #filename evaluates "base1.ext" -- expected  #now weird part -- watch underscore: $filename = "$basename_$count$ext" #filename evaluates "1.ext" -- basename got dropped, gives?

just adding underscore seems throw off powershell's groove! it's weird syntax rule, understand rule. can me out?

actually seeing here trouble in figuring out when 1 variable stops , next 1 starts. it's trying $basename_.

the fix enclose variables in curly braces:

$basename = "base"  [int]$count = 1  $ext = ".ext"   $filename = "$basename$count$ext"  #filename evaluates "base1.ext" -- expected   #now wierd part -- watch underscore:  $filename = "$basename_$count$ext"  #filename evaluates "1.ext" -- basename got dropped, gives?  $filename = "${basename}_${count}${ext}"  # works $filename

hope helps


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