Re: running shell commands from within code

You can use the Runtime class to do this (though your stdin/out streams will
be null):

/* args[0] = name of tini file, args[1..n] are following command line
arguments */
  Runtime runtime = Runtime.getRuntime();
  Process process = runtime.exec(args);
  process.waitFor();
  int result = process.exitValue();

Or if you use the DSFile class you can set your standard streams...

  DSFile dsf = new DSFile(args[0]);  /* args[0] has the name of the tini
file to execute, i.e. 'hello.tini' */
  String[] newargs = new String[args.length-1];
  boolean foreground = true;
  String processname = "someprocessname";
  System.arraycopy(args, 1, newargs, 0, newargs.length);
  System.out.println("About to exec file: ");
  dsf.executeFile(System.in, System.out, System.err, newargs, foreground,
processname);
  Thread.sleep(10000);
  System.out.println("Exec process done");

Kris

----- Original Message -----
From: "Simon Cross" <[email protected]>
To: <tini-6tN4nzCoH/[email protected]>
Sent: Tuesday, February 24, 2004 10:58 AM
Subject: [TINI]running shell commands from within code


> Hi all,
>
> I need someone with a bit more experience of java than me to give me a
> few pointers on this one..
>
> I've got a program called spistartup.tini. What I need to do is have a
> line in this program which executes a command on the slush command line
> to run another program. The command to run is...
>
> >java spiout.tini 27
>
> ... where spiout.tini is the program and 27 is the runtime argument.
>
> I've seen a method called 'execute()' in com.dalsemi.system.TINIOS but
> as a kind of java virgin, the following doesn't really make sense to
> me...
>
> execute
> public static void execute(java.lang.Object[] commandLine,
>                            SystemInputStream in,
>                            SystemPrintStream out,
>                            SystemPrintStream err,
>                            java.util.Hashtable env)
>                     throws java.lang.ExceptionExecutes a command in the
> shell.
> Parameters:
> commandLine - An Object array containing the command in the first
> element, followed by any parameters need for that command in a String[]
> in the second element.
> in - The stream the command will use to get input.
> out - The stream used to report non-critical messages.
> err - The stream used to report critical messages.
> env - A table of environment variables.
> Throws:
> java.lang.Exception - Any exception raised by the command.
>
>
> How do I actually write this into my spistartup.tini program???
>
> Any help would be appreciated.
>
> Regards,
>
> Simon Cross, University of Nottingham, UK
>
>
> www.simoncross.com
> [email protected]
> +44 (0) 77967 444 304
>
>
>
>
>
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