Running Unix command through Java

Hi
I am trying to run the unix command "rf filename" through Java and it doesnt seem to work.
Can anyone help in this case please
String cm = "rm ";
String delFile = args[0]; // this path is /data/temp/filename.doc
Process p = Runtime.getRuntime.exec(cmd +delFile);Also since i dont have access to delete the file through my login i always login as root for a few commands.
Is there a way i can specify user name & password & then run the command?
Please let me know
Thanx

Please discard the above msg i got a solution by just adding file.delete
thanx

Similar Messages

Problem in executing a unix command through java

hi
i'm trying to execute unix command through java
simple shell command like "ls -l >test " but i'm not able to see the result.
there are no error messages.
Code is:
import java.lang.Runtime.*;
class ExecDemo
     public static void main(String[] args)
          Runtime r=Runtime.getRuntime();
          Process p=null;
          try
               p=r.exec("ls -l > test");
          catch (Exception e)
               System.out.println("Error executing nedit.");
}can anyone help please.

get the the inputStream of the runtime object after executing the command.
now use the readLine() function until it becomes null.
egs: with reference to ur code.
InputStream is=p.getInputStream()
while(is!=null)
String s=is.readLine();
if the command don't execute try giving the full path also like /sbin/ls -l

Executing Unix command through Java

Hi,
Hi, I am trying to run some unix command through:
Runtime.getRuntime().exec("some unix command line");
I am running the code on Linux platform. However, I always got some errors. Here are the stack trace of them:
java.io.IOException: Cannot allocate memory
java.io.IOException: java.io.IOException: Cannot allocate memory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
        at java.lang.ProcessImpl.start(ProcessImpl.java:65)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:451)
        at java.lang.Runtime.exec(Runtime.java:591)
        at java.lang.Runtime.exec(Runtime.java:429)
        at java.lang.Runtime.exec(Runtime.java:326)Anybody has any idea why is this happening? Thanks.
Aulia

Hi, thanks for your reply so far. I tried the following code:
     public boolean executeCommand() {
          boolean success = true;
          for (int i = 0; i < 5; i++) {
               Process p = null;
               try {
                    p = Runtime
                    .getRuntime()
                    .exec("ls");
                    InputStreamReader inR = new InputStreamReader(p
                              .getErrorStream());
                    BufferedReader buf = new BufferedReader(inR);
                    String line;
                    while ((line = buf.readLine()) != null) {
                         System.out.println(line);
                    p.destroy();
               } catch (Exception e) {
                    System.err.println(e.getMessage());
                    e.printStackTrace();
                    success = false;
               } finally {
                    p = null;
          return success;
     }However, it still throws the same exception. Yes, I put it in a tight loop, but not recursively.

Running cmd commands through java

Hi,
I am trying to run few dos commands through java using Runtime.exec("command") but I am getting following error
commmand is cd D:\CodeMerge\A\
java.io.IOException: CreateProcess: cd.. error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Unknown Source)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at createDirectory.main(createDirectory.java:24)
Basically what I am looking for is this:
1) My program is in D:\Amit\RM
2) I want to get out to D:\ go to CodeMerge\A\.
3) Create folder with curretn date as name of the folder
Hence I am doing
rTime.exec("cd../..");
rTime.exec("cd D:\CodeMerge\A\");
rTime.exec("mkdir "+date);
Can anybody tell me why I am getting this error
Jounty

U can run either DOS Commands or UNIX Commands thru the following Java Program
Written By BalaNagaraju Malisetti
contact: [email protected]
import java.io.*;
public class RunBdiff
public static String rununixcmd(String v_prev_path,String v_curr_path,String v_delta_path,String v_beg,String v_len)
String s = null;
FileOutputStream fos;
DataOutputStream dos;
try
int v_int_beg = Integer.parseInt(v_beg);
int v_int_len=Integer.parseInt(v_len);
int v_int_end=(v_int_beg+v_int_len)-1;
String v_pos1=String.valueOf((v_int_beg+2));
String v_pos2=String.valueOf((v_int_end+2));
String cmd1 = "bdiff ";
String cmd2=v_prev_path;
String cmd3=" ";
String cmd4=v_curr_path;
String cmd5="| grep '^>'";
String cmd6="| cut -c";
String cmd7=v_pos1+"-"+v_pos2;
String cmd8="| sort ";
String cmd9="| uniq ";
String cmd=cmd1+cmd2+cmd3+cmd4+cmd5+cmd6+cmd7+cmd8+cmd9;
String[] commands = {"/bin/csh","-c",cmd}; //in Unix
//String[] commands = {"cmd.exe","-c",cmd}; //in Windows
Process p = Runtime.getRuntime().exec(commands);
BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
// read the output from the command
File file = new File(v_delta_path);
fos = new FileOutputStream(file);
dos=new DataOutputStream(fos);
//Writing the output of bdiff command to Delta File
while ((s = stdInput.readLine()) != null)
dos.writeChars(s);
//Return Error Message to Calling Procedure
while ((s = stdError.readLine()) != null)
return s;
return s;
catch (IOException e)
return String.valueOf(e);
public static void main(String args[])
String msg=rununixcmd("/home/g_anil/MS_ADDRESS1.dat","/home/g_anil/MS_ADDRESS2.dat","/home/g_anil/MS_ADDRESS_DELTA.dat","1","9");
**************************************************************************************************************************************

GETTING THE OUPUT OF UNIX COMMAND THROUGH JAVA

Hi Guyz...
Please help me in the below code...
My intention is to print the output of Unix command through a java program.
The Java program resides in the Unix Server only.
I have written the below java code , but its not returning any values....
String s1= "ls -lt $APPL_TOP/patch/115/odf/jtfgh.odf";
Runtime r = Runtime.getRuntime();
Process p= r.exec(s1);
StringBuffer ret=new StringBuffer();
InputStream in = p.getInputStream();
int c;
while ((c = in.read()) != -1)
{                  ret.append((char)c);
}     in.close();
out.println("OTUPUT : "+ ret.toString());
Can you please help me in this by debugging the existing code or giving me the exact code??
IT IS URGENT FOR MY PROJECT!!!!!!!!!!!!!!!!!!!!!!!!!!!
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Since you are expecting the shell to expand the environment variable you need to use
String[] s1= {"sh","-c","ls -lt $APPL_TOP/patch/115/odf/jtfgh.odf"};
Also, you should read, digest and implement the recommendations of
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .
P.S Your urgency is not my problem and SHOUTING IS CONSIDERED VERY RUDE!

How do run unix command in java

hi
All unix command working fine in our java program.
but i want change user in linux by using java. it's not working.
"su root" This command onely not working.
anybody know help me
This is my ID [email protected]
This my code
<% String s = null;
try{
Process p = Runtime.getRuntime().exec("su root");
BufferedReader stdInput = new BufferedReader(new
InputStreamReader(p.getInputStream()));
BufferedReader stdError = new BufferedReader(new
InputStreamReader(p.getErrorStream()));
out.println("Here is the standard output of the command:\n");
while ((s = stdInput.readLine()) != null)
out.println(s);
catch(Exception e) {}
%>

I don't have further info to add to your first post, but think your guess seems quite reasonable. I thought of starting a new thread on the same topic, but think this (question) fits in here, too.
I have Java code (freeware, not opensoure), intended for Unix, which basically provides the graphical interface and relies on an I/O layer (C + shell scripts) to do most of the work. I have access to the C+shell scripts which are opensource. I ported it to Cygwin and want to use it under Windows (there is no Cygwin native Java VM).
My problem now boils down to " how to run commands under Unix and what differences are there with Windows". What are the variants?
I have to guess what the program is doing when I get an IOException at some point. E.g.: a call to shell script may be made in a different way as to a compiled exe in Unix?. I found a way to bypass path problems because forward slashes are also accepted and /cygdrive/c construct can be replace by c:/; shell scripts can be compiled into exes using shc and they work; if symbolic links are replaced by duplication of exe files, they work. What will happen in an instance whereby a process runs a shell script dynamically, through a pipe (the shell script is compiled in the Cygwin/win version and receives parameters) in a construct like:
pipefp = epopen(cmdbuf,"w"); /* (cmbuf is "makehdr par1 par2 ... ") (makehdr was a shell script and is now compiled exe for Cygwin/Windows) */?.
Thanks.
LT

Running unix command using java shows error

Hi All,
I am trying to run UNIX move command using Java exec method but its throwing error, unable to rename. Here below is the code i am trying to run to move all files from one directory to another directory. source and destination directory exists.
public class Demo
    public static void main(String args[])
        try
            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec("mv /home/demo1/* /home/demo2");
            int exitVal = proc.waitFor();
            System.out.println("Process exitValue: " + exitVal);
        } catch (Throwable t)
            t.printStackTrace();
}if i give "mv /home/demo1 /home/demo2" in exec method, its working, with * character its giving problem.
Please help me in resolving the problem.
Thank you

Characters like *, >, &, |, etc. are interpreted by the command shell--that is by the bash, zsh, etc. programs. When you execute a command with ProcessBuilder or Runtime.exec, you're not going through one of those shells, so their interpretation of those characters is not available.
In your code, the character * is being delivered directly to the mv command (which doesn't think * is anything special), as opposed to being turned into a list of files and directories as it would be when it's interpreted by the shell. The mv command doesn't know anything about the * character being special.
If you want to have those shell interpretations, you need to execute the command through a shell. One example is like so, but a) you'll want to read up on the methods in exec() that take arrays of String, and b) you'll want to read up on ProcessBuilder, and c) you'll need to check your shell's man pages to see the exact syntax and arguments.
runtime.exec("/bin/bash -c 'mv x/* y'");

Running OpenSSL command through Java Program

How do I execute openssl commands through a java program? Any packages or wrapper classes are there? Please help.
Thanks.

Hi!
What do you mean execute commands? Like: "openssl x509 -in cert.pem -out certout.pem" ??
In that case you can just try the following:
import java.lang.Runtime;
try {
Runtime.getRuntime().exec("openssl x509 -in cert.pem -out certout.pem");
}catch (Exception e) {
e.printStackTrace();
........

Running windows command through java code

Hello
i want to execute jar.exe through java code , i have written following piece of code , but it isn't working
ProcessBuilder processBuilder = new ProcessBuilder(new String[]{"cmd.exe","/c","%java_home%\\bin\\jar.exe"});
          Process process = processBuilder.start();
          BufferedReader inputReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
          String line = inputReader.readLine();
          while(line != null){
               System.out.println(line);
               line = inputReader.readLine();
does anybody knows why
Regards
Edited by: Mayur Mitkari on Mar 5, 2013 10:19 PM
Edited by: Mayur Mitkari on Mar 5, 2013 10:20 PM
Edited by: Mayur Mitkari on Mar 5, 2013 10:20 PM

sorry for that , but the
Runtime runtime = Runtime.getRuntime();
          Process proc = runtime.exec(new String[]{"cmd.exe","/c","jar"});
          proc.waitFor();
int i = proc.exitValue();
this code was different from first one
and in case of Process if runtime .exec is succesful it is wainting for long time , in this case i want if the runtime.exec is succesful something should be returned
Regards

How to run solaris commands through java code ....

Hi,
actually i want to run some solaris commands for zipping some files on Solaris OS...
any idea how can i do that ?
thanks

public class TABLES
public static void main( String[] args )
                  //database is connected
        try
               Connection con = null;
               Statement stmt = null;
               String strShowTables = "";
            ResultSet resultSet = null;
               // CBA Statistics period is m_lStatisticsPeriod minutes
               con = DriverManager.getConnection( g_strRWURI, g_strRWUsername, g_strRWPassword );
               stmt = con.createStatement();
           ResultSet rs = stmt.executeQuery("use db");
         resultSet = stmt.executeQuery(strShowTables);
    String tableName = "";
         while(resultSet.next()){
tableName = resultSet.getString(1);
          System.out.println(tableName);
        break;
String strCmd = "tar cvzf file.tar.gz var/lib/mysql/db/GROUPS.*";
Process p= Runtime.getRuntime().exec(strCmd);
System.out.println(strCmd);
    stmt.close();
            rs.close();
            resultSet.close();
               con.close();
          catch ( Exception e )
               System.out.println( ": Failed to create database connection (" + e.getMessage() + ")" );
               e.printStackTrace();
          catch ( Throwable t )
               System.out.println( " Throwable: " + t.getMessage() );
               t.printStackTrace();
    }//end of main mehtod
}//END OF CLASSi hava tried the above code... what the problem is
when is run that command on shell >    tar cvzf file.tar.gz var/lib/mysql/db/GROUPS.*i works fine but in code even though it didn't give any error but the created "file.tar.gz" is empty...
Edited by: aftab_ali on Apr 7, 2009 7:15 AM
Edited by: aftab_ali on Apr 7, 2009 7:17 AM

Running UNIX command from Java

import java.lang.* ;
import java.io.*   ;
public class TestRunTime
    public static void main(String args[])
        int rc = -1 ;
        String yard = "psnsy" ;
        String ifwList = "[email protected],[email protected]" ;
        String cmd = "/usr/bin/mailx -r oracle -s \"PMC - Missing Interface Files from " + yard +
                           "\" " + ifwList + " < /interface/nwps/missingfiles.txt" ;
        rc = RunThis(cmd) ;
        System.out.println(rc) ;
    private static int RunThis(String str)
         Runtime rt = Runtime.getRuntime();
         int        rc = -1;
         try
            Process p = rt.exec(str);
            p.waitFor() ;
            BufferedReader buf = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = "";
            while ((line = buf.readLine()) != null)
               System.out.println(line) ;
            rc = 0 ;
            return rc ;
         catch ( Throwable t )
              t.printStackTrace();
              rc = -1 ;
              throw new RuntimeException() ;
}When I run java TestRunTime
all it does is hangs and never completes.
I can run the string cmd from the UNIX shell and it runs as expected - I receive an email.

jschell wrote:
sabre150 wrote:
Whether the detail is as you say or as I say does not remove the need to process the exec()ed processes stdout and stderr each in their own thread. Since the OP is not writing to stdin he can handle one of stdout or stderr in the Thread that invokes the exec() but the other needs a separate thread.If the streams are stripped from the process then...
1. They should not be stripped until they are in their own thread.
2. Each requires their own thread.
But since the OP isn't stripping either, no other threads are needed. Nor does the OP need to strip them.I have to disagree. The following code is based on the traps article and sends output to stdout and to stderr from the 'sh' program. Run as is it deadlocks. Run by changing the 'false' to 'true' in the 'if' statement it does not deadlock.
If one changes the code to process only stdout or stderr but not both then it deadlocks.
Running the same code on Windows XP and Windows 2000 but using 'cmd.exe' instead of 'sh' and using 'dir' instead of 'ls' produces the same result.
Running similar code that just runs a perl script without any stdin but that writes to both stdout and stderr it deadlocks if one does not process both stdout and stderr in separate threads.
If one processes the Process stdout and stderr streams then one does not get a deadlock.
This is entirely consistent with what the 'traps' article says and I hope consistent with what I have written in this thread.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
class StreamGobbler extends Thread
    private int count = 0;
    private final InputStream is;
    private final String type;
    StreamGobbler(InputStream is, String type)
        this.is = is;
        this.type = type;
    public void run()
        try
            final InputStreamReader isr = new InputStreamReader(is);
            final BufferedReader br = new BufferedReader(isr);
            String line = null;
            while ((line = br.readLine()) != null)
                System.out.println(++count + "\t " + type + "> " + line);
        } catch (IOException ioe)
            ioe.printStackTrace();
public class Sabre20091015_2
    public static void main(String args[]) throws Exception
        final Process proc = Runtime.getRuntime().exec("sh");
        if (false)
            new StreamGobbler(proc.getErrorStream(), "ERROR").start();
            new StreamGobbler(proc.getInputStream(), "OUTPUT").start();
        final Writer writer = new OutputStreamWriter(proc.getOutputStream());
        for (int commandIndex = 0; commandIndex < 20000; commandIndex++)
            writer.write("echo Index " + commandIndex + "\n");
            writer.write("ls\n");
            writer.flush();
            writer.write("fnaskfdkdhflakjfljd\n");
            writer.flush();
        writer.close();
        final int exitValue = proc.waitFor();
        System.out.println("Exit value = " + exitValue);
}

How to run Unix command with Pipe ( | )?

Dear Friends,
I have to execute the below unix command through java program.
*ps -ewwo pid,args | grep -E "abc.sh|xyz.jar" | gawk '{ print $1 }' | wc -l*
My code to execute this command is,
Runtime run = Runtime.getRuntime();
File workDir = new File("/root/sat");
String psCmd = "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l";
Process process = run.exec(psCmd, null, workDir);
          String line;
          int i = process.waitFor() ;
          if(i == 0) {
          BufferedReader buf = new BufferedReader( new InputStreamReader( process.getInputStream() ) ) ;
          while ( ( line = buf.readLine() ) != null )
               System.out.println("Line - ["+line+"]") ;
          } else {
               BufferedReader stdErr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               // read the output from the command
               while ((line = stdErr.readLine()) != null) {
               System.out.println(line);
               }When i execute this command, i'm getting output as,
ERROR: Garbage option.
When i analyse the above error, i found that, the PIPE ( | ) command is not supported through java.
Could anyone please help me how to execute the above unix command (with | ) in java?
Thanks in advance,
Sathish

The pipe has to be interpreted by a shell so you need
String[] psCmd =
    "sh",
    "-c"
    "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l"
Process process = run.exec(psCmd, null, workDir);You should also read, re-read and then implement the recommendations in the 4 sections of http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .

How to run a unix command in java

Hi all,
I need to run a unix command in my standalone java application.my java program is in windows.Is it possible to run unix command on windows system.help me out.
I tried this
Process p = Runtime.getRuntime().exec("ps -ef");
            BufferedReader stdInput = new BufferedReader(new
                 InputStreamReader(p.getInputStream()));
            BufferedReader stdError = new BufferedReader(new
                 InputStreamReader(p.getErrorStream()));i get IO Exception -Create Process ps-ef error=2

If you want to run a command from java for a windows platform, you should check windows knows the command.
So, load up a DOS prompt and type ps -ef and see what happens.

Running command line commands through java

How do I run other programs through Java and capture their output. E.g. If I want to capture output of 'ls *.txt' what do I do ? If you can paste some sample code or point me to some tutorial that would be cool.
Thanks,

I tried that
Process proc = Runtime.getRunTime().exec("curl " + query);
but now what. From the documentation I could see that
public abstract OutputStream getOutputStream()
might be helpful. But then which OutputStream class to use ? I am looking for a coding example. If you could paste it, that would be great.

Error while running executable file through java in WinNT

I would like to run an executable file with Java.
- If I try with notepad or paint, i.e. Windows Applications,
  I have no problem.
- I also can run Non-Windows-Own Applications, except one.
  I get an error message, if I want to run this program through Java.
I have tried following commands to run an executable file.
Runtime.getRuntime().exec("cmd.exe /c "+command);
Runtime.getRuntime().exec("cmd.exe /c start "+command);
Runtime.getRuntime().exec("cmd.exe /c start /wait "+command);
Runtime.getRuntime().exec("cmd.exe /k start "+command);
command : the path to the executable file
I can run the application directly, if I click the icon on desktop,
but not through Java.
here is the error message I get
screenshot : http://www.aykut.de/error_message.jpg
Text : "Security Check failure"
        The Logon System has been tampered with.
        The Administrator will need to re-install.
my Idea :
The application is "old".
I think it was written for Win 3.1.
Therefore I don't know if there is any other
possibilty to run a "DOS Exe File" through Java.

I have just figured out how it works,
if somebody else here in forum have this problem,
here is the solution :
String path = "F:\...\...\Application.exe";
String envDir = path.substring(0, path.lastIndexOf("\\"));
String[] command = {"cmd.exe", "/c", "start", "/wait", "/D"+envDir, path};
Process process = Runtime.getRuntime().exec(command);
"start /Dpath" => path: environment directory F:\...\...\
"start /wait" => wait until Application.exe terminates
if you use Win95 or Win98 use command.com instead of cmd.exe
Aykut

Running Unix command through Java

Similar Messages

Maybe you are looking for