Ah, so you are using WinXP, it's just that you have a poorly named tool installed. Let me qualify my earlier post.

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Three problems.

• You are using options that would be understood by Windows's dir command, which means you're not running Windows's dir command.

  The dir command is a builtin shell command. It can only be run from within a shell. Since you're not running a shell since you're using the multiple argument form of system, the right dir will never be found.

• You're trying to run a shell command (a pipe). Since you're not running a shell since you're using the multiple argument form of system, that's not going to work.

• You broke up the shell command into bits. How is the shell suppose to execute it?

Solution:

$cmd = 'dir /s/b/a-d | p4 -x - add';
[download]

which is short for

$cmd = ['cmd', '/c', 'dir /s/b/a-d | p4 -x - add'];
[download]

Well, it's suppose to be. The latter doesn't work for some reason.

Update: Removed extraneous quotes that caused the problem identified in the reply.

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