Calling systembuild access commands from a UCB

Is there a way to call system build access commands from a UCB (e.g., using XmathCommand() call)?
The goal is to modify the same UCB or other blocks using SBA modifyblock and have the changes available during the same or the consecutive simulations.
Thanks

Farshid,
If you use a SBA command through XmathCommand then it would affect the model that is in the SystemBuild browser. It will not affect the model of the current simulation. When a simulation is started the model is copied to a new process (simexe). The value of %vars are also copied from Xmath. There fore the changes would only affect the next simulation.
It would probably be more effecient to run the simulation and when it is done decide on the changes and use SBA before the next run.
Why do you want to modify the model while it is still running? What kind of changes do you need to do? Maybe there is some other way to accomplish it.
Carl L
National Instruments

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Calling Operating System Commands from PL/SQL using java

Calling Operating System Commands from PL/SQL - The Java Way
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x Varchar2(2000);
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Calling a Unix Command from Java

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Call OS Command from Database

How Can I call a OS Command from database stored procedure. From Developer I use host command.
Thanks

You can use java stored procedures for this purpose if you are using Oracle8i.
Here is some sample code for doing this.
import java.io.*;
import java.util.*;
public class ExecDemo {
static public String[] runCommand(String cmd)
throws IOException {
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ArrayList list = new ArrayList();
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// read output lines from command
String str;
while ((str = br.readLine()) != null)
list.add(str);
// wait for command to terminate
try {
proc.waitFor();
catch (InterruptedException e) {
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if (proc.exitValue() != 0)
System.err.println("exit value was non-zero");
// close stream
br.close();
// return list of strings to caller
return (String[])list.toArray(new String[0]);
public static void main(String args[]) throws IOException {
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String outlist[] = runCommand("/bin/ls -l");
//String outlist[] = runCommand("/u02/home/usupport/ashehade/java/test");
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System.err.println(e);
Load this to the datbase
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SQL call dbms_java.set_output(2000);
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Call an interactive UNIX command from java

Hi,
I want to call a UNIX command from java. When issue the command 'htpasswd -c filename username' on UNIX terminal, it asks for the new password and the then confirmation password again (yeah, unfortunately the htpasswd installed on our system does not allow you proivde the password on the command line. So have to work interactively ). Now, I have written a simple java program RunCommand.java. I am hardcoding the password for the htpasswd command in the file (in the real situation, password will be generated dynamically). I want to issue 'java RunCommand' on the UNIX command line and get back the command prompt without being asked for the password twice. The code is below, but the Outputstream does not work as expected. It always asks for inputs. Any idea? Many thanks.
import java.io.*;
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System.out.println("Here is the standard error of the command (if any):\n");
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There are only about 9 billion responses a day on how to do this. Use the search feature.

PL/SQL Procedure Calling Java Host Command Problem

This is my first post to this forum so I hope I have chosen the correct one for my problem. I have copied a java procedure to call Unix OS commands from within a PL/SQL procedure. This java works well for some OS commands (Eg ls -la) however it fails when I call others (eg env). Can anyone please give me some help or pointers?
The java is owned by sys and it looks like this
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "ExecCmd" AS
//ExecCmd.java
import java.io.*;
import java.util.*;
//import java.util.ArrayList;
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// set up list to capture command output lines
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System.err.println("process was interrupted");
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for (int i = 0; i < outlist.length; i++)
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The PL/SQL looks like so:
CREATE or REPLACE PROCEDURE RunExecCmd(Command IN STRING) AS
LANGUAGE JAVA NAME 'ExecCmd.main(java.lang.String[])';
I have granted the following permissions to a user who wishes to run the code:
drop public synonym RunExecCmd
create public synonym RunExecCmd for RunExecCmd
grant execute on RunExecCmd to FRED
grant javasyspriv to FRED;
Execute dbms_java.grant_permission('FRED','java.io.FilePermission','/bin/env','execute');
commit
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commit
The following test harness has been used:
Set Serverout On size 1000000;
call dbms_java.set_output(1000000);
execute RunExecCmd('/bin/ls -la');
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SQL> call dbms_java.set_output(1000000);
Call completed.
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OS Command is: /bin/ls -la
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drwxrwxr-x 2 ora9sys dba 1024 Oct 18 09:46 .
drwxrwxr-x 53 ora9sys dba 1024 Aug 13 09:09 ..
-rw-r--r-- 1 ora9sys dba 40 Sep 3 11:35 afiedt.buf
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PL/SQL procedure successfully completed.
SQL> execute RunExecCmd('/bin/env');
OS Command is: /bin/env
exit value was non-zero: 127
PL/SQL procedure successfully completed.
Both commands do work when called from the OS command line.
Any help or assistance would be really appreciated.
Regards,
Bernard.

Kamal,
Thanks for that. I have tried to use getErrorStream and it does give me more info. It appears that some of the commands cannot be found. I suspected that this was the case but I am not sure about how this can be as they all appear to reside in the same directory with the same permissions.
What is more confusing is output like so:
SQL> Set Serverout On size 1000000;
SQL> call dbms_java.set_output(1000000);
Call completed.
SQL> execute RunExecCmd('/usr/bin/id');
OS Command is: /usr/bin/id
exit value was non-zero: 1
id: invalid user name: ""
PL/SQL procedure successfully completed.
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OS Command is: /usr/bin/which id
/usr/bin/id
PL/SQL procedure successfully completed.
Regards,
Bernard

How to call operating system commands?

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Calling systembuild access commands from a UCB

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