Passing directory contents as a single line to an executable in Powershell

Question

I have a binary executable that takes a list of file paths as arguments, e.g.,

C:\Tool.exe C:\Files\File1.txt C:\Files\File2.txt

I would like to call this tool from Powershell. The question is, how can I get the output of get-childitem all on one line?

If I run:

ls C:\Files\*.txt | select FullName

I get one path per line. How can I concatenate the results?

Answer 1

In PowerShell 2.0 you can use the -join operator:

(ls C:\Files\*.txt | %{ $_.FullName }) -join ' '

In PowerShell 1.0 you can set $OFS, which is used to combine a sequence of items when they are used as a string:

$ofs = ' '
"$(ls C:\Files\*.txt | %{ $_.FullName })"