CODEWITHSUNDEEP
javacmdprocessbuilder
Jim
Jim

Reputation: 19562

ProcessBuilder and cmd

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?

Upvotes: 1

Views: 3857

Answers (2)

Axel
Axel

Reputation: 14159

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.

Upvotes: 3

Andreas Fester
Andreas Fester

Reputation: 36630

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

Upvotes: 5

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