Running MS-DOS commands using Runtime.exec()

Is there any way to run the dos commands like copy and del from our java program? Actually I want to implement a visual console kind of thing and have to transfer the commands to the prompt and get the result string that is to be displayed in a JTextArea?
Please help me. It'll be very nice of you...thanks

I can help you in two ways:
o by telling you to run cmd.exe and pass the rest as parameters.
o by pointing out this is the wrong forum for you equestion.

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Running ssh in xterm using Runtime.exec !! URGENT

I am not able to run the following command using Runtime.exec() but if the same command is executed in shell it gets executed.
I am working on solais 8
String toExecStr =
"xterm -e /bin/sh -c \"ssh [email protected] || echo SSH failed. Press any key to quit.; read a \"";
System.out.println("Running command :" + toExecStr);
try {
Process p = Runtime.getRuntime().exec(toExecStr);
catch(Exception e){
e.printStackTrace();
Any clues .. am i missing something Is there some problem with solaris command ..

Can some body help me solve this ???

Can we run a java application using Runtime.exec()?

Can we run a java application using Runtime.exec()?
If yes what should i use "java" or "javaw", and which way?
r.exec("java","xyz.class");

The best way to run the java application would be to dynamiically load it within the same JVM. Look thru the class "ClassLoader" and the "Class", "Method" etc...clases.
The problem with exec is that it starts another JVM and moreover you dont have the interface where you can throw the Output directly.(indirectly it can be done by openong InputStreams bala blah............). I found this convenient. I am attaching part of my code for easy refernce.
HIH
ClassLoader cl = null;
Class c = null;
Class cArr[] ;
Method md = null;
Object mArr[];
cl = ClassLoader.getSystemClassLoader();
try{
     c = cl.loadClass(progName.substring(0,progName.indexOf(".class")) );
} catch(ClassNotFoundException e) {
System.out.println(e);
     cArr = new Class[1] ;
     try{
     cArr[0] = Class.forName("java.lang.Object");
     } catch(ClassNotFoundException e) {
     System.out.println(e);
     mArr = new Object[1];
     try{
     md = c.getMethod("processPkt", cArr);
     } catch(NoSuchMethodException e) {
     System.out.println(e);
     } catch(SecurityException e) {
     System.out.println(e);
try {
processedPkt = md.invoke( null, mArr) ;
} catch(IllegalAccessException e) {
          System.out.println(e);
} catch(IllegalArgumentException e) {
          System.out.println(e);
}catch(InvocationTargetException e) {
          System.out.println(e);
}catch(NullPointerException e) {
          System.out.println(e);
}catch(ExceptionInInitializerError e) {
          System.out.println(e);
}

Problem to execute cvs command using Runtime.exec method

Hello,
I want execute this cvs command, with this options:
cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d "2007/05/01<now" Project
I tried to execute with Runtime.exec() :
Runtime.exec("cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d \"2007/05/01<now\" Project");
But I have an error because the smaller character is interpretate as a redirection, no as a smaller symbol.
How I can do to use this command with Runtime.exec ?
Thanks.
Regards.

Sorry,
I had a typing mistake.
I want say:
Runtime.exec("cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d \"2007/05/01<now\" Project");
Regards.

Running System commands using Runtime.exec()

I'm trying to run an example from "The Java Programming Language" book by Arnold, Gosling and Holmes. I'm trying to run a system level command and get the results. The code looks like:
public static String[] runCommand(String cmd) {
String[] outputData= null;
String[] cmdArray = {"/usr/bin/ls", "-l", "/tmp"};
try {
Process child = Runtime.getRuntime().exec(cmdArray);
InputStream in = child.getInputStream();
InputStreamReader reader = new InputStreamReader(output);
BufferedReader = new BufferedReader(reader);
// read the commands output
int counter = 0;
String line;
while ((line = input.readLine()) != null)
outputData[counter++]= line;
if (child.waitFor() != 0){ // error when it's not 0
System.out.println("Couldn't run the command.");
System.out.println("It produced the following error message : " + child.exitValue());
outputData = null;
} catch (Exception e){
System.out.println("It got here!");
System.out.println("It produced the following error message : " + e.getMessage());
outputData = null;
return outputData;
It gets to the while line, trys to run the input.readLine() and kicks out the exception that looks like:
It got here!
It produced the following error message : null
I know it gets to the input.readLine() because I had a whole lot more try blocks in there, but for simplicity left it out (so it look like the code in the book, which I tried originally). When I run the same command from the command line (on our Sun Solaris 2.8 system) I get results back. I'm not sure what I'm doing wrong. Any help would be greatly appreciated. Thanks.

Hi, duffymo, hope you can help me. Consider this servlet code:
String theCommand = "csh /export/home/gls03/sasstuff/runsas.csh /export/home/g
ls03/sasstuff/gary2.sas";
//Create a parent Process for the sas program subprocess:
Process p = rt.exec(theCommand);
System.out.println("after call to rt.exec(theCommand)");
Here is the runsas.csh script:
#!/bin/csh
setenv LD_LIBRARY_PATH /opt/sybase/lib:/usr/lib:/usr/openwin/lib:/opt/SUNWspro/S
C2.0.1
setenv SASROOT /usr/local/CDC/SAS_8.2
setenv XKEYSYMDB /usr/local/CDC/SAS_8.2/X11/resource_files/XKeysymDB
$SASROOT/sas -sasuser /hpnpages/cgi-bin/applinks/hospcap/tmp $1
The execution never gets to the println statment, here is the error:
class java.io.IOException Exception. Message: CreateProcess: csh /export/home/g
ls03/sasstuff/runsas.csh /export/home/gls03/sasstuff/gary2.sas error=2
java.io.IOException: CreateProcess: csh /export/home/gls03/sasstuff/runsas.csh /
export/home/gls03/sasstuff/gary2.sas error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:66)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:551)
at java.lang.Runtime.exec(Runtime.java:477)
at java.lang.Runtime.exec(Runtime.java:443)
at sasRunnerNew.doPost(sasRunnerNew.java:103)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:262)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:21)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.ja
va:27)
at us.ny.state.health.hin.hinutil.HinFilter.doFilter(HinFilter.java:124)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.ja
va:27)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java:2643)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:2359)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
The command runs fine in unix.
I've also tried using these as arguments to exec:
String theCommand = "/bin/csh /export/home/gls03/sasstuff/runsas.csh /export/home/gls03/sasstuff/gary2.sas";
String[] theCommand = {"csh", "/export/home/gls03/sasstuff/runsas.csh", "/export/home/gls03/sasstuff/gary2.sas"};
These generate the same error. I'm thinking this is a sas-specific problem.
Thanks for any help. Gary

Running jar in unix using runtime exec command

Hi, i want to run a jar in unix with the runtime.exec() command,
but i couldn't manage to do it
Here is the code
dene = new String[] {"command","pwd","java tr.com.meteksan.pdocs.pdf.html2pdf "+ f.getAbsolutePath() + " " + pdfPath};
          System.out.println("Creating PDF");
          FileOutputStream fos = new FileOutputStream(new File(pdfPath));
          Runtime rt = Runtime.getRuntime();
          for(int i = 0 ; i < dene.length ; i++)
              System.out.println("komut = "+dene);
          Process proc = rt.exec(dene);
          // any error message?
          StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR"); // any output?
          StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT", fos); // kick them off
          errorGobbler.start();
          outputGobbler.start();
          // any error???
          int exitVal = proc.waitFor();
          System.out.println("ExitValue: " + exitVal);
          fos.flush();
          fos.close();
when i run this program, the exit value of the process is 0
can you tell me whats wrong?

i changed the string to be executed to:
                         dene = new String[] {"sh","-c","java -classpath \"" + Sabit.PDF_TOOL_PATH
                              + "avalon-framework-4.2.0.jar:" + "" + Sabit.PDF_TOOL_PATH
                              + "batik-all-1.6.jar:" + Sabit.PDF_TOOL_PATH
                              + "commons-io-1.1.jar:" + Sabit.PDF_TOOL_PATH
                              + "commons-logging-1.0.4.jar:" + "" + Sabit.PDF_TOOL_PATH
                              + "fop.jar:" + Sabit.PDF_TOOL_PATH + "serializer-2.7.0.jar:"
                              + Sabit.PDF_TOOL_PATH + "Tidy.jar:" + Sabit.PDF_TOOL_PATH
                              + "xalan-2.7.0.jar:" + "" + Sabit.PDF_TOOL_PATH
                              + "xercesImpl-2.7.1.jar:" + Sabit.PDF_TOOL_PATH
                              + "xml-apis-1.3.02.jar:" + Sabit.PDF_TOOL_PATH
                              + "xmlgraphics-commons-1.0.jar:" + "" + Sabit.PDF_TOOL_PATH
                              + "html2pdf.jar:\" tr.com.meteksan.pdocs.pdf.html2pdf "
                              + f.getAbsolutePath() + " " + pdfPath};
and it works now ;)
thanks...

Problem in executing dos command from runtime.exec(String command);

Hi
i have wriiten a code for running command of DOS-Promt
try
     rnt1 = Runtime.getRuntime();
                              proc1= rnt1.exec("myb");//myb is a batch file      and proc1 is process class instance
                                                            try
                              proc1.waitFor();
                              catch (InterruptedException e)
                         System.out.println("InterruptedException raised: "+e.getMessage());
               catch (IOException ioe)
          System.out.println("IOException raised: "+ioe.getMessage());
But it is giving error while running:
this is showing as an IO exception
CreateProcess: myb error=0
Please help me how to proceed
Thanks

There are 2 possible reasons (perhaps concurrent):
1. The file to be executed is not in the same path of your application, and you MUST specify its whole absolute path as exec() argument;
2. The file to be execute is really (as you call it) a DOS batch file, and then it HAS TO BE NAMED (and called) myb.BAT or (under NT/2000) myb.CMD; WinDOS is Not Unix (WNU): extensions rule!!!

Executing bat file without using Runtime.exec()??

Hi all
From my java App ,I am running a bat file. This is what I did:
When I press 'execute' button inside my App, it runs a bat file through Runtime.exec() method. Since exec() runs it through cmd.exe, get a DOS window when I press Execute button. If I manually runs my app from command promt , I dont get it. But I have to create a short cut of my main class in the desktop. This is happening when I run my app from desktop icon.
Now I want to eleminate DOS popup everytime I press execute button. Would anyone pls give an idea how to run bat file without using Runtime.exec()? Any suggestion will be helpful.
Thanks

jscell
Thanks for taking time to answer to my problem .
Here is what my problem: I create a shortcut of my main class in the desktop. Through this shortcut ,I run my java App. My App has a execute button, When I press this button , It run another bat file through Runtime.exec() method, and show some result in the result PAnel. NOw what happen , I get a DOS command window , everytime I press execute button. , Which is very annoying . But If I run my App thorugh command promt by executing: "java myApp", then I dont get this DOS popup. But I have to create a shortcut in the desktop, so other can use it conveniently.
NOw I am not sure why I am getting this DOS window in the middle of my Application. IS it for using Runtime.exec() method? or for running bat file through my application? Can anyone pls tell me? I am kind of new to java, and I am learning lot of stuff from this forum .
Would u pls suggest me about how to eleminate this DOS popup when I press execute button.
Regrds

How to run db2 command by using Runtime exec

Hello
I am using java. When i am runing db2 command by using Runtime.exec( String cmd, String[] env ). I gave the environment path
DB2CLP=6259901
DB2DRIVER=D:\ibm\db2\java\db2java.zip
DB2HOME=D:\ibm\db2
DB2INSTANCE=DB2
DB2MMTOP=D:\CMBISS
but still I am getting error message
"DB21061E Command line environment not initialized"
after setting the above path in the cmd It is working fine. When i am trying thro java programm i am getting the above error. Can I get answer for this.
bhaski.

Before you can execute DB2 commands you have to open a DB2 CLP. The following code will do so:
import java.io.IOException;
public class Db2 {
     public static void main(String args[]) {
          try {
               Runtime rt = Runtime.getRuntime();
               Process child = rt.exec("db2cmd");
               child.waitFor();
          catch (IOException io) {
               io.printStackTrace();
          catch (InterruptedException e) {
               e.printStackTrace();

Running Dos Command using Java

How do i run a particular Dos command using a simple java class?

Process process = Runtime.getRuntime().exec( ... );
Search the forum. There are plenty of examples.

Trying to run external script using Runtime.exec

Hey,
I am trying to use Runtime.exec(cmd, evnp, dir) to execute a fortran program and get back its output, however it seems to always be hanging. Here is my code snippet :
            Process process = Runtime.getRuntime().exec(
                  "./fortranCodeName > inputFile.txt" , null, new File("/home/myRunDir/"));
            InputStream stream = new InputStream(process.getInputStream());
            InputStream error = new InputStreamr(process.getErrorStream());
            BufferedReader stdoutReader = new BufferedReader(new InputStreamReader(stream));
            BufferedReader erroutReader = new BufferedReader(new InputStreamReader(error));
            System.out.println(stream.available()); //returns 0
            System.out.println(error.available());     //returns 0
            while (true) {
                String line1 = stdoutReader.readLine(); //hangs here
                String line2 = erroutReader.readLine();
                if (line1 == null) {
                    break;
                System.out.println(line1);
                System.out.println(line2);
            }I know for a fact that this fortran code prints out stuff when run it in terminal, but I don't know if I have even set up my Runtime.exec statement properly. I think I am clearing out my error and input streams with the whole reader.readLine bit I have above, but I am not sure. If you replace the command with something like "echo helloWorld" or "pwd", it prints out everything properly. I also am fairly confident that I have no environmental variables that are used in the fortran code, as I received it from another computer and haven't set up any in my bash profile.
Any Ideas?

Okay, so I implemented the changes from that website (thanks by the way for that link, it helps me understand this a little better). However, my problem is still occuring. Here is my new code:
            class StreamThread extends Thread {
            InputStream is;
            String type;
            StreamThread(InputStream is, String type)
                this.is = is;
                this.type = type;
            public void run()
                try
                    InputStreamReader isr = new InputStreamReader(is); //never gets called
                    BufferedReader br = new BufferedReader(isr);
                    String line=null;
                    while ( (line = br.readLine()) != null)
                        System.out.println(type +">"+ line);
                    } catch (IOException ioe)
                        ioe.printStackTrace();
        try {
            Process process = Runtime.getRuntime().exec(
                  "./fortranCodeName" , null, new File("/home/myRunDir/"));
            StreamThread stream = new StreamThread(process.getInputStream(), "OUTPUT");
            StreamThread errorStream = new StreamThread(process.getInputStream(), "ERROR");
            stream.start();
            errorStream.start();
            int exitVal = process.waitFor(); //hangs here
            System.out.println("ExitValue: " + exitVal);

How to invoke the command interpreter to run the "NS.exe" using Runtime?

hi,everyone
I need to invoke the command interpreter,and enter the disk directory "c:/ns2/bin/",then run the "ns myfilename" command.My program is followed:
try{
String s[]=new String[4];
s[0]="cmd.exe";
s[1]="/c";
s[2]="cd c:/ns2/bin";
s[3]="ns.exe c:/ns2/bin/100n-500k-5.tcl";
Runtime R=Runtime.getRuntime();
Process p=R.exec(s);
int exitVal = p.waitFor();
System.out.println("Process exitValue: " + exitVal);
But this doesn't work!
please help me! thanks!

hi,everyone
I need to invoke the command interpreter,and
and enter the disk directory "c:/ns2/bin/",then run
the "ns myfilename" command.My program is followed:
try{
String s[]=new String[4];
s[0]="cmd.exe";
s[1]="/c";
s[2]="cd c:/ns2/bin";
s[3]="ns.exe c:/ns2/bin/100n-500k-5.tcl";
Runtime R=Runtime.getRuntime();
Process p=R.exec(s);
int exitVal = p.waitFor();
System.out.println("Process exitValue: " +
alue: " + exitVal);
But this doesn't work!
please help me! thanks!CDing will not change the directory.
should write:
String cmd= "cmd /c c:\\ns2\\bin\\ns.exe c\\ns2\\bin\\100n-500k-5.tcl"
for further details on how to use Runtime.exec(), see http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

How can I run a dos command from java on windows 98, 95?

The usage of cmd.exe in the java program to run a dos command on windows 98. 95 doesn't work as the equivalent command is command.exe
But using the command.exe in the java program makes my program to hang.

hi,
As u mentioned, u cannot use the cmd.exe in win9x environment as cmd.exe is specific to windows NT, you can use the command.exe without any hitches.
for eg
java.lang.Runtime.getRuntime().exec("start command /K a.bat"); should run the batch file a.bat..
if the problem persists, try posting the snippet of code that you are using.
cheerz
ynkrish

Running a dos command

Hi guys,
I've created a prog that runs as a server and you can telnet into and give it commands to execute programs on the remote computer. All using runtime.exec().
Just wondering if anyone knows how i can send a dos command to it such as COPY \\192.168.1.2\temp \\192.168.1.3\temp.
If i use "cmd.exe /c start cmd.exe" then it opens the window its just i cant remember how to send the dos command to it, as i actually wrote the program several months ago.
Cheers for any help
Andy

One way is to put the dos commands inside a batch file and 'exe' the batch file. Not sure if you also mean you don't want to see the new dos window ( use min to minimize that new window for that ), or not.

Using runtime.exec,process streams

Hi all,
I am using runtime.exec to execute a batch file(rmdir /s/q directoryname) which deletes all the files in a certain directory(including subdirectories). However, some of the files are not deleted since they are being used by other processes.
I have closed all file references but still the batch file says they are being used by other processes. The File.canWrite() method however, returns true for all the files. I have also tried to delete the files using file.delete but it does not work.
So I have 2 questions.
1. Can I forcibly delete these files some other way.
2. If i call a batch file to delete the files and it fails on some files, the command window displays "cannot delete files". How can I write out thse messages into a text file which i can use as a log file.Do I have to use Process.getInputstream()/Process.getInputstream() ? If so, how?
Thanks for your help.
Vinny

I tried the following before but the string i get is always empty, but i can see there are messages in the command window. Please let me now if i am doing something wrong.
try{
Process p = rt.exec("cmd.exe /c start deletefiles.bat");
InputStream ins = p.getInputStream();
byte[] bytearray = new byte[1024];
int bytecount;
String dos_string="";
BufferedInputStream bis = new BufferedInputStream(ins);
while ((bytecount = bis.read(bytearray, 0, 1024)) > -1) {
String str = new String(bytearray,0,bytecount);
dos_string += str;
System.out.println("dos string is" +dos_string);
catch (Exception e) {
System.out.println("Error: " + e);

Running MS-DOS commands using Runtime.exec()

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