Executing linux command

Hi Guys,
From Java,I want to change the current user to "su",providing the password as well under linux.Do some tasks and go back to the last user.
For example,I tried something as follows which didnt work!
String cmd[]={"su","password"};
Runtime.getRuntime().exec(cmd);
Finish some tasks with the super user like deleting some files
Go back to the previous user.
String cmd[]={"Exit"};
Runtime.getRuntime().exec(cmd);
These are the commands normally used on a Linux shell command.How to do it from a java program.I use Java5.
Thanks
P

Kohinoor wrote:
These are the commands normally used on a Linux shell command.How to do it from a java program.I use Java5.I haven't tried this recently but I'm pretty sure you won't be able to do this because the password will have to be supplied from the keyboard driver and not written to the stdin (they are not the same) of the 'su' program. I would have thought your best bet would be to use SSH via one of the Java SSH libraries. Google is your friend.

Similar Messages

How to execute Linux command from Java app.

Hi all,
Could anyone show me how to execute Linux command from Java app. For example, I have the need to execute the "ls" command from my Java app (which is running on the Linux machine), how should I write the codes?
Thanks a lot,

You can use "built-in" shell commands, you just need to invoke the shell and tell it to run the command. See the -c switch in the man page for your shell. But, "ls" isn't built-in anyays.
If you use exec, you will want to set the directory with the dir argument to exec, or add it to the command or cmdarray. See the API for the variants of java.lang.Runtime.exec(). (If you're invoking it repeatedly, you can most likely modify a cmdarray more efficiently than having exec() decompose your command).
You will also definitely want to save the returned Process and read the output from it (possibly stderr too and get an exit status). See API for java.lang.Process. Here's an example
java.io.BufferedReader br =
new java.io.BufferedReader(new java.io.InputStreamReader(
Runtime.getRuntime().exec ("/sbin/ifconfig ppp0").
getInputStream()));
while ((s = br.readLine()) != null) {...

Execute linux command from java

I wanna execute linux command from java, bu the output has error:
Return code = 1
top: failed tty get
The code as:
import java.io.*;
public class Execute {
     public static void main(String[] args) {
          try {
               final Process process = Runtime.getRuntime().exec("top");
               new Thread() {
                    public void run() {
                         try {
                              InputStream is = process.getInputStream();
                              byte[] buffer = new byte[1024];
                              for (int count = 0; (count = is.read(buffer)) >= 0;) {
                                   System.out.write(buffer, 0, count);
                         } catch (Exception e) {
                              e.printStackTrace();
               }.start();
               new Thread() {
                    public void run() {
                         try {
                              InputStream is = process.getErrorStream();
                              byte[] buffer = new byte[1024];
                              for (int count = 0; (count = is.read(buffer)) >= 0;) {
                                   System.err.write(buffer, 0, count);
                         } catch (Exception e) {
                              e.printStackTrace();
               }.start();
               int returnCode = process.waitFor();
               System.out.println("Return code = " + returnCode);
          } catch (Exception e) {
               e.printStackTrace();
}Help please.

Your code is probably good to run a program, that does not use terminal capabilities.
Program "top" is a little bit more complicated - you have to run it with a real terminal.
Try to run "xterm -e top". You can find an example how to run an external program
from java code in cnd/gdb module on http://cnd.netbeans.org
For example, take a look at openExternalProgramIOWindow() method on this page:
http://cnd.netbeans.org/source/browse/cnd/gdb/src/org/netbeans/modules/cnd/debugger/gdb/proxy/Attic/GdbProxyCL.java?rev=1.1.2.6.2.5&only_with_tag=release551_fixes&view=markup
It runs a command with external terminal.
Thanks,
Nik

Unable to execute Linux command from Java

Hi,
I am currently working on a code wherein i need to execute Linux command from Java. Below are some of the query i have.
1) Is there any efficient method of running OS commands from Java, rather than using Runtime and Process method.
2) Below is details of my code which fails in execution
**-- Java Version**
java version "1.6.0"
OpenJDK Runtime Environment (build 1.6.0-b09)
OpenJDK Server VM (build 1.6.0-b09, mixed mode)
-- Program Code ----
Where <path> = Path i put myself
package test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.*;
public class GetInode{
     * @param args
     public static void main(String[] args) {
          GetInode test = new GetInode();
          test.getInode();
     public void getInode(){
          String command = "/usr/bin/stat -Lt <path>;
          System.out.println(command);
          Process process;
          Runtime rt;
          try{
          rt = Runtime.getRuntime();
          process = rt.exec(command);
          InputStreamReader isr = new InputStreamReader(process.getErrorStream());
          BufferedReader bre = new BufferedReader(isr);
          BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream());
          System.out.println(bre.readLine());
System.out.println(br.readLine().split(" ")[7]);
          process.destroy();
          }catch (Exception ex){
               System.out.println("Error :- " + ex.getMessage());
------Output -------------
/usr/bin/stat -Lt "<path>"
/usr/bin/stat: cannot stat `"<path>"': No such file or directory
Error :- null
Can any one help me what is wrong and why i am unable to run the Linux command from Java.

For clarity purpose............i m submitting actual code here
--- Code ---
package test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.*;
public class GetInode{
* @param args
public static void main(String[] args) {
GetInode test = new GetInode();
test.getInode();
public void getInode(){
String command = "/usr/bin/stat -Lt \"/afs/inf.ed.ac.uk/user/s08/s0898671/workspace/CASWESBLIN/TestFS/01_FIL_01.txt.txt\"";
System.out.println(command);
Process process;
Runtime rt;
try{
rt = Runtime.getRuntime();
process = rt.exec(command);
InputStreamReader isr = new InputStreamReader(process.getErrorStream());
BufferedReader bre = new BufferedReader(isr);
BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
System.out.println(bre.readLine());
System.out.println(br.readLine().split(" ")[7]);
process.destroy();
}catch (Exception ex){
System.out.println("Error :- " + ex.getMessage());
--- Output ---
[ratz]s0898671: java GetInode
/usr/bin/stat -Lt "/afs/inf.ed.ac.uk/user/s08/s0898671/workspace/CASWESBLIN/TestFS/01_FIL_01.txt.txt"
/usr/bin/stat: cannot stat `"/afs/inf.ed.ac.uk/user/s08/s0898671/workspace/CASWESBLIN/TestFS/01_FIL_01.txt.txt"': No such file or directory
Error :- null
-- Linux Terminal --
If i copy the first line from the output and execute on Linux terminal her is the output that i get
[ratz]s0898671: /usr/bin/stat -Lt "/afs/inf.ed.ac.uk/user/s08/s0898671/workspace/CASWESBLIN/TestFS/01_FIL_01.txt.txt"
/afs/inf.ed.ac.uk/user/s08/s0898671/workspace/CASWESBLIN/TestFS/01_FIL_01.txt.txt 12003 24 81a4 453166 10000 1c 360466554 2 0 1 1246638450 1246638450 1246638450 4096
Can you just assist me where am i really making mistake.......i was wondering if the command that i pass from Java....can be executed on Linux terminal why is it faling to run from java.........and when i print the Error Stream for process output........it show cannot Stat.......

Execute Linux Command via JSP

How can I execute Linux commands through a JSP page on a Red Hat Linux 6.1 Machine using Tomcat 3.0
Please Mail your answer
[email protected]

Hi Nick,
Thankx a lot, for suggestion,
I wanted to make a page which gives me a text box to write a command and below it shows the result of that command,
Say , I m in directory "/home/dhiraj"
and I write in command text box : "pwd"
it should give me the currrent path in result , which I can show in form of HTML as Results ,
(may be in a String form..)
same way if I write in command box : "ls -l"
it should Return me (say a String) the directory listing of the current path in result,
I have already tried the Runtime & Process class ,
Runtime rt = Runtime.getRuntime();
Process p =null;
p = rt.exec("command here");
p.waitFor();
it has following problems:
1) This way I m not able to get the result ..
2) I tried to make a zip file via my program it did not threw any exception , but could not execute...
I was confused is it 'coz of permission ( rights problem) or some programmatical error as the same program runs via a Java Class file ..
desperately waiting for ur suggestions
Dhiraj Agrawal
MCA student and a Trainee in a local Software House
reply to: [email protected]

Need to execute Linux Commands in JSP

Hi I am Srinivas,
I am new to this forum,
{color:#ff0000}I want to execute Linux Commands(which is remotely connected through putty) in a JSP Page.{color}
{color:#0000ff}My requirement is to display df -h output on a JSP page.{color}
This is because we will monitor disk space at regular intervals.
Can anyone help me in this regard.
Thanks & Regards
Srinivas V.
Edited by: Srini-XIUS on Mar 24, 2008 2:06 AM

I think you might need the java 'robot' class.
However, a JSP page displayed on a browser is running in a secure enviornment that will probably not let you access the computer its running on. Instead, create a serlvet back on the server that runs the robot class. The servlet will send the data to the jsp page for display. The jsp page can send commands to the servlet which will execute it via its robot class.

Problem in executing Linux command from Java Programme.

hi everybody,
can anybody help me to solve one problem i have.
i want to capture the output of linux command "grep" in my java programme.but it is not working properly .(maybe this sub-process doesn't have permission to read files)
here is my code and corresponding outputs.
import java.io.*;
public class BSearch
public static void main(String kj[])
try
Runtime rt=Runtime.getRuntime();
String command="grep \"hello\" -r /usr/MyDir ";
Process rtProc=rt.exec(command);
InputStream is=rtProc.getInputStream();
BufferedReader br =new BufferedReader(new InputStreamReader(is));
String line =null;
while((line=br.readLine()) != null)
System.out.println(br.readLine());
br.close();
catch(Exception e)
System.err.println("Error in command "+e);
it finds "hello" pattern only in BSearch.class file although if i fire this command on LINUX prompt it
shows all the files in /usr/MyDir which contain "hello" pattern.
java programme output :
Binary file /usr/MyDir/BSearch.class matches.
linux command output :
/usr/MyDir/one.txt: hello sdfs
Binary file /usr/MyDir/BSearch.class matches.
/usr/MyDir/two.txt: kjsdf hello sdfsdf
will anybody help me solve this problem.

It may be a Problem of Catching the Echoes back from the Processes...I have a Program which Captures the Echoes..see if it works
import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.beans.PropertyChangeSupport;import java.lang.ref.WeakReference;/** * Implements a proxy property change listener using a weak reference to avoid memory locking that would occur if it * was a strong reference. To understand this, we hve to understand that the property change listeners themselves are * hilding onto panels and other objects with strong java references. If the panel goes away while we are viewing an * object, we have a circular emory hold situation where the panel cant be collected because it has ahold of the * property and the property cannot because it has ahold of the pane. If we use weak references instead, then the hard * link between the listener and the producer is softened to almost nothing. */public class WeakPropertyChangeListener implements PropertyChangeListener { /**   * A poperty change support object is included here so that the listener can remove   * himself from the listeners if the reference internally goes to null.   */ private PropertyChangeSupport pcs = null; /** Holds the weak reference to the real listener. */ private WeakReference weakRef = null; /**   * Constructs a new Proxy object for the given support and listener.   * @param pcs The property change support that this object will be using.   * @param pcl The real listener.   */ public WeakPropertyChangeListener(PropertyChangeSupport pcs, PropertyChangeListener pcl) {    if (pcs == null) throw new NullPointerException("pcs");    if (pcl == null) throw new NullPointerException("pcl");    this.pcs = pcs;    weakRef = new WeakReference(pcl); } /** @see <{PropertyChangeListener}> */ public void propertyChange(PropertyChangeEvent changeEvent) {    Object referrant = weakRef.get();    if (referrant == null) {      pcs.removePropertyChangeListener(this);    } else {      ((PropertyChangeListener)referrant).propertyChange(changeEvent);    } } /** Returns true for comparison to referrant or this. */ public boolean equals(Object obj) {    if (obj instanceof WeakPropertyChangeListener) return super.equals(obj);    else if (obj != null)return obj.equals(weakRef.get());    else return false; }}// snipet public void addPropertyChangeListener(PropertyChangeListener listener) {    this.propertyChangeSupport.addPropertyChangeListener(      new WeakPropertyChangeListener(this.propertyChangeSupport, listener)); } public void removePropertyChangeListener(PropertyChangeListener listener) {    this.propertyChangeSupport.removePropertyChangeListener(listener); }

Executing linux command from Java code

Hi ,
I have a web application running on JBoss on Linux platform.
I need to execut certain shell command of linux through servlet or JSP, so that I can display the command results on UI.
If you have done something similer sort of thing then please shed some light on it.
TIA,
Sachin

Sorry for the wrong post...please ignore this..
Thanks,

Execute linux command and getting its output in java

i want to run a simple command from java: telnet localhost 8649 > report.txt
how can I do this.

See java.lang.ProcessBuilder

Executing a linux command through flash lite

Hello All,
i want to know one thing.. : is it possible to execute a linux command through flash lite?
I mean, say, in linux at the command prompt if i want to change the date and time then i will execute command date 082110452009.00 to set
21 August 2009, 11:45:00 .. i want to do this through actionscript2.. first i wil provide a UI asking the user to set date, time, year.. once he clicks OK i want to execute the above command with the user input..
This is because currently i m running this application on an embedded linux device which doesn't have a real time clock.. i mean once i switch off and ON the device the date and time will set back to default value 01 Jan 1970 as it happens in linux..
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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

How to execute linux sh command from inside CF

I am using CFMX 7,0,0,91690 Enterprise on Redhat Enterprise Linux 4.9 with Apache webserver 2.0.52. I have a coldfusion template that queries from a Postgresql 8.0 database, copies the data from the queries into a set of files in one folder on the linux server, and then has a CFEXECUTE tag at the very end that calls a bash shell script on the same server. The shell script takes the files from the one folder, merges some of their content together, moves them to another folder, adds header and footer, and sets ownership and permissions. These 2 scripts have been in place and working perfectly for several years now. No changes were made to content, permissions, or ownershop of scripts. Suddenly last Friday the coldfusion script seems to have lost its ability to execute the shell script properly. It does execute it and the shell script attempts to do some of the steps, but the resulting files are missing the content and have the linux environmental variables and their values displayed instead. Clearly its getting an error but that is not being reported back to me. After the CF script ends, if I manually execute the shell script from the linux command line, it works perfectly. I tried giving it more permissions but that did not help. Redhat support suggests I run the script with "sh -x" to get more detailed output for debugging, but I would need to do that from inside the CF script since that is where the problem is. Is it possible to execute a shell script from inside a CF script using a linux "sh" command in some way (instead of the cfexecute, just so I can see debugging info)? Thanks in advance for any suggestions. Julie

Thanks for the suggestion, tried that too:
<cfexecute name="/bin/sh" arguments="-x /bin/siscopy" outputfile="/home/coldfusion/sh_output.txt" timeout="600" />
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It does not complete the task of making the files, and the sh_output.txt file which is supposed to capture the -x output, is empty.
Thanks,
Julie

How to execute Linux OS command from ODI

We have installed Oracle data integrator on windows machine and want to execute linux OS command in a procedure or scenario from ODI .
How could i do that ?
I can see os command elements but they do not work, only windows commands work.There should be linux technology i think

Obviously you can execute Unix OS commands only on Unix OS. Why do you expect Windows to understand it?
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Executing sudo linux commands through a JSP page.

Hi,
I need to execute some superuser commands through a JSP page under Linux.
I added users apache and tomcat to the /etc/sudoers file with no password prompting.
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Here is a piece of my code (very basic):
String cmd="linux_cmd";
Process proc = Runtime.getRuntime().exec(cmd);
InputStream stdin = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(stdin);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ( (line = br.readLine()) != null)
out.println(line);
Is there any way I can make sudo calls from a JSP page ?
I know that making root calls from a web application is a bad thing, but for now security is not my concern.
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JavaFan2 wrote:
In fact, I help supervising a student project who is supposed to write an admin application to offert graphical interfaces for some security and system tools under Linux (like fdisk, iptables etc) using J2EE, ... something like Webmin.
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And no, it's no good saying "But I'm only going to use this all-powerful master key to open my own office door". If you get the key then anybody else can get the key too.

Linux Commands Executable in Terminal?

Hello Unix & Terminal users,
I'm wondering if the following Linux commands can be executed in Terminal on OS X?
fdisk /dev/sde
d # delete the existing partition
u # switch units to: sectors
n # new partition
p # primary
1 # first partition
XXX # first sector = XXX
<enter> # press enter to select last sector automatically
t # change partition type
c # change it to FAT32
a # make it bootable (required for later firmware)
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After changing the partition table, reformat the memory card with
mkfs.vfat /dev/sde1
The commands are intended to be used on a memory card.
Thanks in advance,
Maximilian

looks like you should be able partiton with [fdisk(8)|http://developer.apple.com/documentation/Darwin/Reference/ManPages/ma n8/fdisk.8.html], at least the binary is present.
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Linux - Execute external Command (SM69, SXPG_COMMAND_EXECUTE)

Hi experts,
I've defined in SM69 a external command for our Linux-Host.
This command I execute with Function Module SXPG_COMMAND_EXECUTE.
However, I always get the exception 2 - Command not found.
The test in Sm69 works fine.
We are also having HP-UX Hosts and on this the command works fine.
Also other commands works fine on Linux-Host.
The command is: ls -l (so command = ls, command parameter = -l)
Does anyone know the reason for this?
Kind regards

Do you really need it ?
could you use kernel function ? or you really need the SM69 ?
looks how to use the kernel function of OS command : abap - report to execute os-commands - Code Gallery - SCN Wiki
regards
Fred

Executing linux command

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