Unix System Calls using Java

Hi!
Can anyone tell me how to do Unix System Calls in my Java program?
If possible please give me the java code for it taking one unix system call as an example.
Thanks in advance
Raj

do you mean firing off a shell command, or making actual kernel API calls or C library calls?
for shell commands, have a look at Runtime.exec(). for kernel calls, use JNI. the JNI FAQ mentions something called "shared stubs" that may be of use:
http://java.sun.com/products/jdk/faq/jnifaq.html
cheers,
p

Similar Messages

How do i make UNIX system calls in Java app?

Is it possible to make UNIX system calls in a java app? I.E. perform a file copy/move to another machine within a program.
Thanks,
Erik

If there is a command line tool then you use Runtime.exec() otherwise you have to use JNI.
If you want to access shared libraries you might want to look at www.swig.org

System id using java

how to get system id using java ,also MAC address?

I think you have to use JNI and write the native calls on whatever platform(s) you need this.

How to access system calls from java program?

i am having a doubt regarding accessing system calls from a Java program like accessing unix system calls from a c program.

Runtime.getRuntime().exec("line command here");
example:
Runtime.getRuntime().exec("ls -la");

Monitor Unix Mail Queue using java

Hi! ,
I want to monitor unix mail queue using java. how can i proceed..
Please advice..
Thanks..
Ganesh

Google and see if there is an API which lets you monitor it.
Kaj

How to read system eventlog using java program in windows?

How to read system eventlog using java program in windows?
is there any java class available to do this ? or any one having sample code for this?
Your friend Zoe

Hi,
There is no java class for reading event log in windows, so we can do one thing we can use windows system 32 VBS script to read the system log .
The output of this command can be read using java program....
we can use java exec for executing this system32 vbs script.
use the below program and pass the command "eventquery"
plz refer cscript,wscript
import java.io.*;
public class CmdExec {
public static void main(String argv[]) {
try {
String line;
Process p = Runtime.getRuntime().exec("Command");
BufferedReader input =
new BufferedReader
(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line);
input.close();
catch (Exception err) {
err.printStackTrace();
This sample program will list all the system log information....
Zoe

How to read system evenlog using java program in windows

How to read system evenlog using java program in windows???
is there any java class available to do this ? or any one having sample code for this?
Your friend Zoe

Welcome to the Sun forums.
>
How to read system evenlog using java program in windows???>
JNI. (No.)
>
is there any java class available to do this ? or any one having sample code for this?>You will generally get better help around here if you read the documentation, try some sample code and come back with a specific question (hopefully with an SSCCE included).
>
Your friend Zoe>(raised eyebrow) Thank you for sharing that with us.
Note also that one '?' denotes a question, while 2 or more generally denotes a dweeb.

Stoping System Clock using Java code.

Is it possible to do so if yes then some code idea for
Stoping System Clock using Java code.
[email protected]

The system clock is controlled from the BIOS, and as such, I don't think even windoze can stop it, though it can be continually reset. I don't believe that Java provides a sufficiently low level of control to set the system clock, although you could use a native method to accomplish the task.
Why would you want to do such a thing?

Set system classpath using java program??

Hi,
I want to set the System classpath using java program. Can somebody please tell how to do this.
Prashant

but this will set the classpath for that particular JVM only.
Isn't it??? I want that of SYSTEM so that user can access that class path from any JVM instance.
Prashant

System configuration using java

Hi friends
Can I get System configuration using java code.
If yes plz suggest how.
thanks in advance.. Anjana

some bits and pieces are available see the details in
System.getProperties():
Properties sysProps = System.getProperties();
meration en       = sysProps.keys();
while ( en.hasMoreElements() )
//add the key=value pairs
Object keyObj    = en.nextElement();
String key       = ( String ) keyObj;
Object valueObj = sysProps.getProperty( key );
System.out.println( key + " : " +
+ valueObj.toString());
de]
just an idea??YES, and also you can do
System.getenv();but they also don't give all the info the OP was/is looking for.

Internal system call used by "ps" command

Hi All,
Can any one let me the internal system call used by "ps" command to retrieve the process information. I want to use the same system call in my program to get list of information about processes currently running in the system. I do not want to use the "ps" command in my code.

Justin_Samuel wrote:
Hi All,
Can any one let me the internal system call used by "ps" command to retrieve the process information. I want to use the same system call in my program to get list of information about processes currently running in the system. I do not want to use the "ps" command in my code.You can access the /proc filesystem for getting information about
processes, even more than is available via ps.
Have a look at:
man -s 4 proc

How to invoke Default printer of my system by using java application

I need to invoke default printer of my system by using java application ? could u plz help me out with sample code?

VoodooMagic.getDefaultPrinter().print();
http://www.javaworld.com/javaworld/jw-10-2000/jw-1020-print.html
Look for more at Google.

How can i get system variable using java

Hi,
I just want to know how can i get system variables using java code.
for example i want to get the the date for today or i want to get the number of processes that's running.
Thanks alot

Hi,
I just want to know how can i get system variables
using java code.
for example i want to get the the date for today or i
want to get the number of processes that's running.
Thanks alotSome generic "system variables" are available though Java, usually through the System class.
Date today = new Date();
is instantiated with the current date and time.
Other system values, like environment values, should be passed to java through the command line (-D option) by setting system properties.
Finally, platform specific values like the number of processes running will have to be written in platform specific code and executed by JNI (java native interface).
Java is platform or system agnostic. Common system values, like time, are implemented. Hopefully you won't need platform specific values.

Can i change system time using java

hi guys can i change system time using java iam doing one app in that i have to change the system time (my os is windowsXP) please tell me how to change the time

What does this have to do with Swing?
Well, there is no Java API that I'm aware of.
However you can execute any Windows command by using the Runtime class. So you should be able to invoke the Time command.
Search the Java Programming forum. There are plenty of examples on using the Runtime.exec(...) command.

Unix system() system call in Java

Hi,
system() call in Unix is very helpfull when you need to implement a piece of code that is already implemented in an exsiting utility.
Is there a way to achive a similar functionality?
To put it in simpler words - is there a way, in Java, to call some method that will invoke a Unix shell and will execute the command specified in the string that is past in?
Could you please CC the reply to [email protected]
Thanks,
-Michael

Runtime.exec()
> Could you please CC the reply to [email protected]
Certainly not.

Unix System Calls using Java

Similar Messages

Maybe you are looking for