ProcessBuilder and cmd

Question

Why does

ProcessBuilder pb = new ProcessBuilder("cmd","/C","dir");

work but

ProcessBuilder pb = new ProcessBuilder("cmd","dir");

does not.
I mean in the latter case the cmd starts but the listing of the directory does not happen.Why is this?

What does not work? Is an error thrown? Which?

user1907906
– user1907906

2013-03-08 09:38:00 +00:00
Commented Mar 8, 2013 at 9:38 — user1907906
– user1907906, Commented Mar 8, 2013 at 9:38

Andreas Fester · Accepted Answer · 2013-03-08 09:39:01Z

It is the normal behaviour of cmd.exe - the same happens on the command line:

C:\>cmd dir Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\>cmd /c dir Volume in drive C is System Volume Serial Number is ABCD-EF10 ...

With the first call, you are creating a new (interactive) command interpreter process, cmd.exe. With the second call, you are creating a new command interpreter process and tell it to execute the given command and then exit:

/C Carries out the command specified by string and then terminates

Axel · Accepted Answer · 2013-03-08 09:41:38Z

Because cmd.exe works like that. Try this in a command window:

cmd dir

and

cmd /C dir

Also have a look at help cmd for an explanation.

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