On Wed, 4 Aug 1999, Susan Moffat wrote:
> Hi
>
> I'm trying to perform unix commands from my Java program and have
> tried using the Runtime class as follows:
>
> Process proc = Runtime.getRuntime().exec("/bin/sh -c \"ls;pwd\"");
>
> to try to perform more than one command in the same runtime
> instance. Apparently calling exec again will result in a new
> process being ran and as I'm trying to perform the commands using
> the same instance (I'll actually be trying to use the "su" command
> and perform several commands whilst as the superuser).
>
> I've also tried writing to the returned Process class's output
> stream by using a BufferedWriter taking an OutputStreamWriter from
> the Process.getOutputStream() method - to no avail. As when I
> perform the flush() on the writer, an IOException occurs with a
> write error thrown in the FileOutputStream.write() method, which
> flush() inherits from.
>
> Has anyone managed to perform operating system commands from within
> their Java code?
Did you try it without the ";", i.e. with just a single command? I
have a feeling that might be the problem.
If that does work, maybe you could put your series of commands in a
script, and exec that. Or perhaps you could try using csh instead of
sh and use csh's "()" construct (you can put multiple ";" separated
commands in the parentheses.
Milt Epstein
Research Programmer
Software/Systems Development Group
Computing and Communications Services Office (CCSO)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]
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