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I would like to input all the filenames in the current directory after an application name, like so:

root\file1.ext
root\file2.ext
root\file3.ext

$ app.exe file1.ext file2.ext file3.ext

I could write a batch file that could do this automatically and add it to the PATH variable, which is an okay solution. But can PowerShell for example let me write a command like this on-the-fly?

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You can use this:

app.exe (dir *.ext)
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Alternatively:

dir *.ext | app.exe $_

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I don't think this can work. The $_ can only be used in a pipeline context 9i.e. a process block) – zdan Jul 16 '11 at 18:39

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