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Message:

Runtime

Posted by Peter Kelley on February 08, 2002 at 4:32 PM

The Runtime.exec() does not work like a commandli line. It does not understand redirection. You would need to read the output from the proc.getInputStream() and then redirect it yourself.

Michael Daconta wrote an excellent article on this is Java World. Here is a link to it.
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Good luck,

Peter

> I have a problem :

> Process p=Runtime.getRuntime().exec("pr -l 61 a.txt> b.txt");

> After I Run java Program, the file "b.txt" doesn't created.
> Does anybody know why? It seems java Runtime doesn't know what is the ">"?

> Thanks a lot!

>
> > interesting problem
> > did u get the soln
> > if so please pass it on
> > thanks
> > thomas

> > > my problem is using the Runtime's exec method i've launched a code like this

> > > Process p = Runtime.getRuntime().exec("java test");
> > > - in a abc.java program -

> > > in that particular 'test.java' which i am launching using the Runtime's exec method, i have written one
> > > ----
> > > System.out.println("hello world");
> > > System.in.read(byteArray);
> > > ----
> > > I was able to retrieve
> > > the 'hello world' string using an inputstream

> > > but i was unable to send some string data to that process which is hanging there at system.in.read?

> > > How to solve this?