UNIX script with Runtime.exec and ssh

I am trying to run a script that is on a UNIX server which doesn't require a password to connect to. Here's my code:
String _cmd = new String("ssh -l root mach01 \"(/projects/examples/findsw java)\"");
Process proc = Runtime.getRuntime().exec(_cmd);
InputStreamReader is = new InputStreamReader(proc.getErrorStream());
BufferedReader br = new BufferedReader(is);
String line = null;
while ( (line = br.readLine()) != null)
_logger.error(line);
proc.waitFor();
The error outputs:
ERROR [Thread-7] beans.RunScript - sh: (/projects/examples/findsw java): not found
INFO [Thread-7] beans.RunScript - _proc.exitValue() = 1
When I execute _cmd directly from xterm, I have no problems.
Thanks

Runtime.exec is not a shell and doesn't run a shell. Try
adding something like "/bin/sh -c" or whatever shell you use to the beginning of the command.
BYe!
EXP

Similar Messages

Problems with Runtime.exec() and certain Unix processes

Certain Unix processes don't behave correctly when run from Java using Runtime.exec(). This can be seen by running /bin/sh and trying to interact with it interactively. The issue appears to be that /bin/sh (and many other Unix tools) are checking the file handles on the spawned process to see if they are associated with a TTY.
Is there any way to associate a process spawned by Runtime.exec() with a terminal or alternatively, is there a JNI library available that would setup the process correctly and still provide access to the input and output streams?
Our objective is to have the flexibility of expect in being able to run and interact with spawned processes. A bug was opened at one point but closed back in 1997 as being a fault in the spawned process, not Java.
Bug ID: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4058689

#include <stdio.h>
void doit() {
int c;
        while((c=getc(stdin)) != EOF) {
                printf("%c",c);
int main() {
        freopen("/dev/tty", "r", stdin);
        doit();
}This program reopens its standard input against /dev/tty and catenates it to stdout. And voila, it takes its standard input from the terminal, even though it was started with stdin against /dev/null..
$ gcc b.c -o b
$./b < /dev/null
buon giorno
buon giorno

Run Linux script with Runtime.exec

Hi there!
I want to run some Linux script files out of a Java application.
I'm currently using a code like this:
Runtime rt = Runtime.getRuntime();
Process p=rt.exec("//home//scriptFile1");But this isn't working. Although I'm getting no exeption, the file isn't executed.
It looks like he's doing something, but he's definitly not processing the file.
I think the problem is probably, that in scriptFile1, I call some other script files (which call itself some other script files).
E.g. like this:
scriptFile1:
scriptFile2
binary1
binary2
scriptFile3Any ideas?
Thank you!

Hi! I now get at least some error messages, when I call the script file:
knoppix@Knoppix:~/Desktop$ java Main
start
ERROR>/media/hda5/scripts/startds_2: line 1: stop: command not found
ERROR>/media/hda5/scripts/startds_2: line 3: dspp_2: command not found
ERROR>/media/hda5/scripts/startds_2: line 5: killcan: command not found
ERROR>/media/hda5/scripts/startds_2: line 7: canpdemsimeit: command not found
ERROR>/media/hda5/scripts/startds_2: line 9: demsimeit: command not found
ERROR>/media/hda5/scripts/startds_2: line 11: guidemsimeit: command not found
ERROR>/media/hda5/scripts/startds_2: line 13: MCAbrowser: command not found
ExitValue: 0These "lost" commands are all located in the same directory as the script I call, so I wonder why.
I could adjust every command by adding in front of it the absolute path in the script file. That would work. But maybe I can pass in some other way the directory, in which he should search for the commands. That would save me a lot of work...
I will RTFM but if anyone has currently an idea: please post...
THX

Problem with Runtime.exec()

Hi,
I'm having a problem with Runtime.exec() . I have a batch file with debug option to FTP the desktop file to mainframe. When I executed this in Windows it's shows me the responce from the server (like ' Transfer Completed' ) for my FTP commands. But when I launch this through java it's only shows the errors not the normal responces from the server. I need this responses to confirm the proper transfer of file.
My Java Code:
String strCommand = "cmd.exe /c " + outdirectory + batchfilename;
boolean bWait = true;
Runtime r = Runtime.getRuntime();
Process pr = r.exec(strCommand);
BufferedInputStream bis =new BufferedInputStream(pr.getInputStream ());
int c=0;
/** Outlet for IO for the process **/
while (c!=-1) {
c=bis.read();
/**Now wait for the process to get finished **/
if(bWait == true){
pr.waitFor();
pr.destroy();
My Batch file is :
FTP -n -d -s:C:\IT2.cmd > C:\tIT2.log
EXIT
Thanks
Sathiesh

Ahh, you are redirecting the standard out from the ftp command to a file, therefore no output is sendt back to your java code,
you have to redirect the stderr stream, not the stdout stream in your batch file;
FTP -n -d -s:C:\IT2.cmd 2> C:\tIT2.log(notice the "2>" instead of ">")
Now your batch file should direct the error stream to the log, and the standard output back to the java program.
(I'm used to UNIX streams, not NT, but the "2>" redirection should work on NT also I guess)

Runtime Exec and ProcessBuilder

I have an object (textTicket) which is a formatted transaction label. Here is an example:
CROSS PLAINS QUARRY CROSS PLAINS TN 37049 2549
MATL SPREADING NOT GUARANTEED
615-654-9942 TOLL FREE 877-654-9942
Date: 01/19/2009 04:45:46
Job No: PU-2008
Q Num::
Cust No: 30000001 Src Num::
Sold To: CASH SALE
Address: INTERNAL
NASHVILLE,TN 37202
Ord By:
Ord No: Rate Zone:
Location:THANKS YOU
Mat. & Haul170.28 Sev Tax:0 Tax16.60
Acc Total:1308.16
Total186.88
3/4 TO 4/67'S
Gross: 40500 St. Item:
Tare: 12120 P.O.: MIKE MILLER
Net: 28380.0
Net Tons: 14.19
Proj:
Truck #: 1
Hauler: Phy Truck: 248251
I am attempting to pass this textTicket object to a shell script that will send it out the port for printing. I have tried using the Java Comm API however, we have intermittent problems with the API running on an Oracle Appserver. Sometimes, the data never gets sent to the port. So what I am trying to do is just call a shell script that echos the textTicket out the port via redirection. The problem arise when I use the ProcessBuilder or runtime exec and I have to convert the textTicket to a string via textTicket.toString. The textTicket then losing all of its formatting. Any ideas on how to keep the formatting as I am passing the textTicket to the shell script.

My example did not save into the post very well. For instance, the first line "Cross Plains Quarry" should be center on the paper. The object contains \t\t to get it center.
For example on the runtime.exec, I am doing the following
public void printShell(String port, String string){
     String[] params={"/usr/ts/bin/prttick.sh", string, port};
     try {
               Process p=Runtime.getRuntime().exec(params);
          } catch (IOException e) {
               // TODO Auto-generated catch block
               SerialCommunicator.logger.debug("error" + e.getMessage());
The variable string is textTicket.toString();

Launch Acrobat Reader with Runtime.exec() under WINNT4, without absolut pat

Hi,
I would like to launch Acrobat Reader from a Swing application. This works fine with Runtime.exec() as long as I provide the full path to the AcroRd32.exe. The problem is that I cannot predict the location of this exe on the systems of the users. Athough is in the Windows PATH, since I can launch from the windows execute-dialog, the Runtime.exec() is not able to locate the file.
How can I solve this problem?
Thanks a lot!
Horst

hey BIJ, thank you so much man. start really does wonders!! i was stuck with invoking a fortran program for last couple of days and now i went through your postings and tried with start. it did work!!
thanks again,
bhairampally

Reading InputStream from Runtime.exec() and ffmpeg?

I've got a lot of things going on here and I'm having trouble debugging. I'm working on a streaming music player, and the platform only handles MP3 natively. Specifically, the method that handles incoming requests has to return an InputStream for further processing upstream (out of my visibility).
I'm trying to extend the music player to play AAC files with the extension ".m4a". To do this, my plan is to transcode from MP3 to AAC using Runtime.exec() and ffmpeg, and then return an InputStream that contains the MP3. This works fine if I use ffmpeg to transcode to a temp file, and then return a FileInputStream constructed from that temp file. But like I said, this is supposed to be a steaming music player, and the blocking for the ~30 seconds it takes to completely transcode to a file is too much of a delay.
So what I'm trying to do is have ffmpeg transcode to stdout, and then use Process.getInputStream() to return the InputStream that contains ffmpeg's stdout while the transcoding is still going on. This doesn't work and I'm not sure why. (I'm fairly new to java, and this is the first time I've used Runtime.) My player just hangs there. I know Runtime is picky about exhausting the stdout and stderr streams, so I'm not sure if it's something related to that, or if I somehow need to buffer the stdout before returning it, or if I need to run something in a different thread, or if I'm just completely barking up the wrong tree.
If anyone has any experience with something like this, or can point me at some code that implements something similar, I'd appreciate the help.
Below a sample of the code in question. Also, for what it's worth, all of the console messages that I put in there are printing, but the music doesn't play.
   public InputStream getStream(String uri) throws IOException
             System.out.println("Entering Factory.getStream()");
              System.out.flush();
            File file = new File(URLDecoder.decode(uri, "UTF-8"));
            if (file.exists())
                 if(file.getPath().toLowerCase().endsWith(".mp3")) {
                        // This code for playing MP3 files works correctly
                      System.out.println("Playing MP3");
                      System.out.flush();
                      InputStream in = new FileInputStream(file);
                      return in;
                 else if(file.getPath().toLowerCase().endsWith(".m4a")){
                      System.out.println("Playing M4A");
                      System.out.flush();
                      // Create array for ffmpeg command line
                        // This command line transcodes to STDOUT
                      String[] command = { this.ffmpeg_path,
                                                         "-i",
                                                         "input.m4a",
                                                         "-acodec",
                                                         "libmp3lame",
                                                         "-ac",
                                                         "2",
                                                         "-ab",
                                                         "256",
                                                         "-f",
                                                         "mp3",
                      // Begin transcoding with ffmpeg
                      System.out.println("Transcoding...");
                      System.out.flush();
                      Runtime runtime = Runtime.getRuntime();
                      Process ffmpeg = runtime.exec(command);
                      // Must exhaust error stream, or the application can become deadlocked.
                      System.out.println("Exhausting stderr...");
                      System.out.flush();
                      this.exhaustInputStream(ffmpeg.getErrorStream());
                      // Return ffmpeg's stdout as an input stream
                      System.out.println("Returning stdout...");
                      System.out.flush();
                      return ffmpeg.getInputStream();
                 else {
                      System.out.println("Unsupported Audio File");
                      System.out.flush();
                      return null;
            else
                // We aren't requesting a file, so let the API handle the request upstream...
                return super.getStream(uri);
     private void exhaustInputStream(final InputStream inputStream) {
              // Since InputStream.read() blocks, exhast the stream in a separate thread
              new Thread() {
                   public void run() {
                        try {
                             while(inputStream.read() >= 0) {
                                  // Just throw the bytes away
                        catch(IOException e) {
                             e.printStackTrace();
              }.start();
         }

Read this article
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Killing Internet Browser opened with Runtime.exec

I am running Win NT 4.0 and I am successfully opening my HTML help using the following code:
String command = new String("cmd /K ");
command = command.concat("G:\editor\help\index.html");
Process p = Runtime.getRuntime().exec(command);
However, if I run p.destroy(), the browser window does not close. This means that the help remains open after the program exits and also that multiple help windows can be opened.
Does anyone know how to kill a browser opened with Runtime.exec()?
Thanks for any help you can offer,
Christopher Collins
Marineering Limited

Thanks jmschrei,
I tried System.exit(0) and Runtime.getRuntime().exit(0) and neither succeeded in closing the internet browser process. I suspect that process.destroy() and runtime.exit(0) both are killing the instance of the command interpreter spawned by runtime.exec("cmd /K URL") and not actually the browser opened by that command. Therefore, I think that the process refers to the "cmd" and not the browser, which probably opens completely independently of my Java program, thus can't be closed by it.
Unforetunately, I don't know another way to open a browser.
If anyone has any additional suggestions, I would appreciate it. Many people in the forums seem to have asked this one, and there are no solutions I could find.
Christopher

Any problem with Runtime.exec()

I am required to launch a local exe from an applet. At present I am using AppletContext.showDocument().The problem with this is that in netscape a box is popped up forcing the user to save that exe file. The requirwment is to run it directly without any message being asked.
A workaround is to use Runtime.exec(), it works, however I have heard that it is not platform independent.
(1) Is there a better solution than Runtime.exec() ?
(2) If not could you give me some info on Runtime.exec() and the problems associated with it ?
(3) Is there a way to use AppletContext.showDocument() without the message being asked ?
Shikari.

First of all, Java is platform independent language, and has many security restriction in it's applets.
so from an applet you can't excute a program using "Runtime.getRuntime().exec()".
coz. there is security restriction on that.
for the "AppletContext.showDocument()" this methid is for displaying the specified document on the client browser, so it can't excute a client program.
if u need to use Runtime.getRuntime().exec() you have to get the client agreement for that.
see the applet security restriction for more info.

Runtime.exec and setting environment variables

Runtime.exec and setting environment variables
I need a decent example which works on Windows.
Got any?

Thank you.
I was hoping for an example of the use of
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Runti
e.html#exec(java.lang.String,%20java.lang.String[]) or
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Runti
e.html#exec(java.lang.String,%20java.lang.String[],%20j
va.io.File) which take environment variable
information such as PATH.
The reason is because there is a library which is
being loaded via loadLibrary (
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Syste
.html#loadLibrary(java.lang.String) ). However, for
the child process to find the library the PATH needs
to be updated.
Any example regarding changing the PATH variable via
Java so that libraries can be loaded and processes
created? (Perhaps, I should make a new post and
restate the question with this more explicit
information?)
That won't work. LoadLibrary occurs in the JVM environment. As I said you can't change the JVM environment via exec().
If the shared library needs something in the path then you are going to have to set the path before your application starts up.
If you just need to load the library from someplace that is not on the path then you should be using System.load().

Runtime.exec() and apostrophe?

Hi there,
I try to execute a Unix program using Runtime.exec(). This works as long as I don't need any apostrophe characters:
works: <path>/<program> <someArguments>doesn't work: <path>/<program> <someArguments> -ls='rm /tmp/test.xml'In the latter case, I get an error message stating a syntax error.
But when I enter exactly the same command directly into the shell, I don't get an error. Instead, the desired behavior occurs.
Note: The parameter "-ls" lets the program execute a command once certain criteria are met. But the command in question is not part of the problem. For example, -ls=ll works...
Thanks in advance for your help! :-)
btw.: I've already read the "When Runtime.exec() won't" document, so I'm quite sure I didn't run into the shown pitfalls. Well, it could be related to the "Runtime.exec() is not a command line" section, but I haven't been able to figure out how to correct it.
Kind regards,
Dennis

I guess you can remove the test for the SunOS operating system
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.Runtime;
import java.lang.Process;
import java.lang.InterruptedException;
import java.util.StringTokenizer;
public class JExec {
     private static int lastExitValue = 0;
     public static int getLastExitValue() {
          return lastExitValue;
    public static final String osName= System.getProperty("os.name");
    public static byte[] execUNIXcmd(String commande, byte[] outputData, boolean closeStream) throws NullPointerException {
          Runtime runtime = Runtime.getRuntime();
          Process process = null;
          InputStream inputStream = null;
          OutputStream outputStream = null;
          byte[] bBuf = null;
          String tmpStr = null;
          if (!osName.equals("SunOS")) {
               System.err.println("Unsupported Operating System");
               throw new NullPointerException();
          } else {
               // Dans le cas de SunOs
               try {
                    process = runtime.exec(commande);
                    outputStream = process.getOutputStream();
                    inputStream = process.getInputStream();
                    if (outputData != null) {
                         outputStream.write(outputData);
                    if (closeStream) outputStream.close();
                    process.waitFor();
                    lastExitValue = process.exitValue();
                    bBuf = new byte[inputStream.available()];
                    inputStream.read(bBuf, 0, inputStream.available());
                    if (!closeStream) outputStream.close();
                    inputStream.close();
                    return bBuf;
               } catch (InterruptedException e) {
                    System.err.println("ERROR ("+osName+"): Enable to wait the process");
                    throw new NullPointerException();
               } catch (IOException e) {
                    System.err.println("ERROR ("+osName+"): Enable to read input lines");
                    System.err.println("->"+e.getMessage());
                    throw new NullPointerException();
     public static void main (String[] s) {
          String commande = "echo '$PATH'";
          System.out.println(new String(JExec.execUNIXcmd("sh -e", commande.getBytes(), true)));
}

Problems with Runtime.exec inside OC4J in OAS!!! help!!

Hi all,
I have a method on my webapplication and the same call a script .cmd on windows and a .sh on unix using Runtime.exec command, inside this script have a call to a java program ie.
java JMSAdmin < jcajms.txt
OK, this is fine in OC4J Standalone 10.1.3 in windows and linux but in OAS 10.1.3 the same not run and not throw any error. Its is a BUG ?? limitation ?? OAS ignore a call to another java ??
please help.
Tanks

Normally, you must prepend the command with a call to the command shell (eg /bin/sh).
But I suspect that this call isn't allowed due to Java EE specification restrictions.

Calling Unix-Script from within Oracle and store stdout/stderr in table

Hi,
What I want to do is:
1. Calling a UNIX script (e.g. hello.sh) (from inside the Database)
hello.sh
echo Hello World!
2. and get the stdout/stderr output back in my Database in a table (e.g. temp_back)
table temp_back
ID stdout stderr
1 Hello World!
I think Number 1 isnt a big problem, but how to get stdout back in DB?
Any solution?
I searched a bit in this Forum and found this Post.
re:Calling Host Command Through Database Procedures or Triggers
This may be what I am searching for, but cant access the Link
Since I am not really fit with UNIX and packages/procedures in Oracle it would be nice if you could post a very detailed answer.
(Please no java)
-What packages do I need? (heard DBMS_OUTPUT would be useful)
-example PL/SQL script
Thanks a lot!
Marcus
Environment:
Oracle 9.2.0 DB

Marcus, if you opened the Java sandbox to access any o/s file, you can call any Unix command, shell script, or program, that the Oracle o/s user has exec privs on.
Just remember that there's a very basic Unix environment when you make the call - the settings in the .profile does not apply. Thus PATH for example is not set. When making the call make sure that the complete path is given. As for the environment, that is a problem as you cannot set that and make the call at the same time.
In that case it is much simpler to rather write a Unix shell script that does all for you. Set the environment. Run the command(s). Format output. Etc.
Then you call that Unix script, via Java, from SQL or PL/SQL. Treat the Unix scripts like the Unix-version of stored procedures for your Oracle application.
Some technical details. When you connect to Oracle, a Unix process services you. This can be either a dedicated server process (servicing only your Oracle session) or a shared server process (from the shared service pool of processes).
In either case, it is a Unix process running as a background process (thus detached from any tty device). PL/SQL and SQL are executed by this process. The Oracle JVM created by your session also lives in this process. When you therefore make o/s calls, these calls are made by this process.
Therefore you are limited to what this process can and can't do. E.g. it runs as the oracle o/s user and will fail on accessing paths and commands does the oracle user does not have privs on. Etc.

Runtime.exec() and batch files

I am having a problem on Windows 2000 while trying to execute a batch file with the Runtime.exec() method. Basically, the exit value returned from the call to Runtime.exec(), returned specifically by the waitFor() method in the Process class, is always zero, even if the batch file fails miserably. After looking into batch files further, it seems to me that the only way to get the exit value of the commands run in the batch file back to the Runtime.exec() call is to put "EXIT %ERRORLEVEL%" in the batch file. What this actually does is exit the command(cmd) shell that the batch file was running in with the exit code of the last command run. This is all great when calling the batch file with a Runtime.exec() call, but when you run it in a cmd window, the window closes when the batch file completes, because the call to EXIT exits the entire shell. I guess i'm just wondering, am i correct in assuming the exit value returned to the java process is going to be the exit value of the shell in which the batch file is running? I need to have the exit value actually indicate whether the batch file ran successfully or not, and if i have to put in the EXIT %ERRORLEVE% (which exits the cmd shell with the exit value of the last command run), then i'll do that, but if someone knows a better way of doing this, i am all ears. Thanks in advance

To run any command from java code, the method is
Runtime.getRuntime().exec( myCommandString )
Where, myCommandString is something like "/full/pathname/command".
If the pathname contains spaces (specifically in Windows), e.g. "c:\program files\windows\notepad", then enclose it in quotes within the quoted string. Or pre-tokenize them into elements of an array and call exec(String[] cmd) instead of exec(String cmd).
From JDK1.3 there are two new overloaded Runtime.exec() methods. These allow you to specify starting directory for the child process.
Note, there is a gotcha associated with reading output from commands. When the runtime exec's the process, it passes to it 3 streams, for stdin, stdout, and stderr; the out and err are buffered but the buffer size isn't very big. When your process runs, it reads (if needed) from in, and writes to out and err.
If it doesn't write more than the buffer-size, it can run to completion.
But if it tries to write more data to one or the other stream than the buffer can hold, the write blocks, and your process hangs, waiting for you to empty the buffer so it can write some more.
So after the exec call, get the streams, and read from them in a loop until they both hit end-of-stream (don't block on either one, just read whatever is available from each, each loop iteration).
Then when the streams have ended, call the process.waitFor() method to let it finish dying.
Now, here is a code snippet how you achieve this.
String strCommand = "cmd.exe /c " + strCommand;
// For Solaris / unix it will be
// String strCommand = "/usr/cobra/sol/runInstaller.sh";
boolean bWait = true;
//execute the command
try
     Runtime r = Runtime.getRuntime();
     Process pr = r.exec(strCommand);
     Process pr = r.exec(callAndArgs);
     BufferedInputStream bis =new BufferedInputStream(pr.getInputStream ());
     int c=0;
     /** Outlet for IO for the process **/
     while (c!=-1)
          c=bis.read();
     /**Now wait for the process to get finished **/
     if(bWait == true)
          pr.waitFor();
          pr.destroy();
catch(Exception e)
     System.out.println("Could not execute process " + strCommand);
     return(false);

Error in opening a file with name in chinese characters with Runtime.exec

The issue at hand is when I try to open a file with file name containing chinese characters in a localized environment in Windows through the following java code:
Runtime.exec("rundll32 SHELL32.DLL,ShellExec_RunDLL {File_With_FileName_containing_Chinese_character}");
the following error is thrown by windows.
Cannot open file "C:\??.txt".
with the exception
java.io.IOException: CreateProcess: [Ljava.lang.String;@f5da06 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:566)
        at java.lang.Runtime.exec(Runtime.java:428)
        at java.lang.Runtime.exec(Runtime.java:364)
        at java.lang.Runtime.exec(Runtime.java:326)
        at Launcher.main(Launcher.java:26)
When I try to use the same command (shown below) from the Windows Run command, the file opens sucessfully
rundll32 SHELL32.DLL,ShellExec_RunDLL {File_With_FileName_containing_Chinese_character}
Please suggest.
Thanks in advance

This may be a file association problem. To solve that:
In Windows 7:
1. Right-click the file,
2. Select "Open With"
select [Your Program Here]
3. Check always use this program.
In Windows XP:
1. Locate the file as you have described above
2. Right click the file
3. Select Open with from the pop-up menu
4. Click Choose default program…
5. Select Excel in the Recommended Programs box
6. Check Always use the selected program to open this kind of file
7. Click on OK.
1. Make Excel not available from Office 2007 listed under Programs and Features in Control Panel.
2. Take a registry backup using the steps given here
3. In the registry editor window expand HKEY_CLASSES_ROOT and navigate to .xls right and delete it.
4. Exit Registry Editor
5. Undo Step 1 to make Excel available.
6. Restart the computer and verify it the issue is fixed.
If this answer solves your problem, please check Mark as Answered. If this answer helps, please click the Vote as Helpful button. Cheers, Shane Devenshire

UNIX script with Runtime.exec and ssh

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