String draw size, in a linux command environment

I need to get the string length as it displays on screen (for image generation). First i did this through a simple php script but i discovered that the standard method in php is way off by 200 +pixels. Thus i would like to know if i can get the string draw size through java in the command environment. Or if there are other ways to get the size plz tell me i really need a sollution to this php bug.
Of course i tried to dig into the font class but it uses the X11 graphics which aren't available
any help is welcom

if you install the linux server as command prompt the X11 graphics (windows) arn't installed / started thus the java graphics awt is useless for it uses the X11 server
anyway i'll look into the font measuring for i'm getting wierd deviation in the counts of to scripts:
script 1 php based (first try)
1783 newwidth for str 2064 Fred Tanja
1806 newwidth for str 2064 <|>
1979 newwidth for str 2064 Plaats hier je bericht!
2002 newwidth for str 2064 <|>
2120 newwidth for str 2064 Martijn marcel
script 2 java based
1689 newwidth for str2064 Fred Tanja
1713 newwidth for str2064 <|>
1872 newwidth for str2064 Plaats hier je bericht!
1895 newwidth for str2064 <|>
2009 newwidth for str2064 Martijn marcel
see the wierd deviation of 120 pixels? the lengths where both gotten with php's imagepsbox (in java by calling an exernal script)
i just can't seem to figure out what is wrong it's the same string same font same size (those are read from the same config file ) anyway i'll get a clear head and try again tomorrow maybe its in the derived font

Similar Messages

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.......

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); }

How to call linux command ?

hi all,
I wanna make java application which display the ouput of linux command (eg. ps -ax output in JTextArea).
The problem is how to call "ps,kill,etc" ?

JTextArea txtOutput = new JTextArea();
String cmd = "ps -a";
Process proc = Runtime.getRuntime().exec(cmd);
BufferedReader buf = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String out;
while ((out = buf.readLine()) != null){
System.out.println("Output: "+out);
txtOutput.append(out+"\n");
}

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

Problem in running Linux command using JavaRuntine

All,
When I ran a Linux command in Java Program It does not give a correct output instead it returns null string.
When I ran the Qsub command( as given in the below program) in Java program I suppose to get Unable to run job: unknown resource "mechhpc1".Exiting. as an output. But it returns null string. It works fine in linux terminal.
Can you please anyone help me to fix this issue?
Regards,
Thamizhannal P
Source code:
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class QSubCmdTest {
     static String Qsub = "sudo -u tce qsub -S /bin/bash ansys_p3 "
               + "-pe Parallel 3 -l h_rt=3:4:4,ansys=0.333,mechhpc1=0.333 "
               + "-a 0804081247.15 /home/tce/c1p4/AnsysParallel";
/* The aboove command output in terminal (linux machine)
Unable to run job: unknown resource "mechhpc1".Exiting. */
     static String QSUBcommandOutput = "";
     public static void main(String[] args) {
          System.out.println("Job Submission testing");
          try {
               Process processExecGenericJobScript = Runtime.getRuntime().exec( new String[]{"/bin/bash","-c",Qsub});
               //QSUB Command output Reader
               BufferedReader QSUBcommandOutputReader = new BufferedReader(
                         new InputStreamReader(processExecGenericJobScript
                                   .getInputStream()));
               System.out.println("Reader "+QSUBcommandOutputReader.readLine());
               //QSUB command output string
               String QSUBCommandOutputString = "";
               while ((QSUBCommandOutputString = QSUBcommandOutputReader
                         .readLine()) != null) {
                    QSUBcommandOutput += QSUBCommandOutputString;
                    QSUBcommandOutput += "\n";
               System.out.println("QSUBcommandOutput:" + QSUBcommandOutput);
          } catch (Exception exp) {
               exp.getMessage();
}

I would expect error messages to be output on stderr not stdout and you only read stdout. You should read, digest and implement the recommendations in http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .

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..
any suggestions?

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

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]

Arch Linux Netboot Environment under grub legacy

I am trying to boot under grub legacy with the following menu.lst entry:
Arch Linux Netboot Environment
root (hd0,5)
kernel ipxe.krn
initrd conf.ipxe
boot
This does not work. Do you have any suggestion?
Last edited by francois.e (2013-01-07 02:49:52)

Indeed - more information is needed.
What is your partitioning scheme, is sda6 your /boot parition? Are your kernel and intrd in /boot/grub/? This would be unusual, but it is what that entry implies. Also, where is your root partition specified?
You also don't need the boot command in the menu.lst. I don't know if it would cause a problem, but I've never seen it there. In addition to the links in cfr's signature, you should (have already) read the wiki page on grub legacy.
Last edited by Trilby (2013-01-06 04:35:54)

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.
My JSP page works fine with any usual linux command, but when I call a sudo cmd I have a message (when reading the ErrorStream instead of the InputStream) that sudo cant be executed because it needs a tty even when I call the shell before the sudo command.
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.
Thank you for any tips.

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.
As I said, I know that is has a huge security risk but this app has the only purpose of learning J2EE, no security issues are treated.If you want to say "I will leave my office door open because there's no security risk in doing that" then that's a valid statement. But what you are trying to do here isn't the equivalent of leaving your office door open. It's the equivalent of finding a master key for all the offices in the world. And as such it is in fact a serious security risk which should not be circumvented.
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.

Invoke a linux command from with in a java servlet

Hi Everyone,
I am kind of new to Linux and Tomcat server technology. I have been trying to run a servlet that would run a linux command using the "Runtime.getRuntime().exec( cmd );" in java. I tried running the command in an independent Java Program and it runs fine. I am trying to do the same thing in a servlet so that I could invoke and execute the linux command when I invoke a servlet URL. But it does not seem to work. I mean the servlet program compiles well and prints all the html text but the command does not get executed. It does not give any error messages either. The program is as follws:
public class Example1 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
PrintWriter output;
     response.setContentType ("text/html");
     output = response.getWriter();
     StringBuffer buf = new StringBuffer();
     buf.append ("<html>");
     buf.append ("<head>");
     buf.append ("<title>\n");
     buf.append ("A Simple Servlet Example \n");
     buf.append ("</title>");
     buf.append ("</head>");
     buf.append ("<body>\n");
     buf.append ("Welcome to Servlets in SSL Command \n");
     buf.append ("</body>");
     buf.append ("</html>");
     System.out.println("Hello Linux");
     String cmd = "";
     cmd = "cp file1.txt file2.txt";
     System.out.println(cmd);
     try
          Runtime.getRuntime().exec( cmd );
     catch( java.io.IOException e )
          System.out.println("\n " + e.toString());
     output.println(buf.toString());
     output.close();
do you have any suggestions reagarding this. Thx in Advance.
Regards
nsk

Read this before you do anything with Runtime.exec:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
I agree with Annie: it's a bad idea to put code like this in a servlet. Move it into a JavaBean that you can test off-line and then let your serlvet simply instantiate it and call its methods.
This will tie your app into Linux, of course. Sure you absolutely have to do this? Write an interface and a factory method to hide this implementation detail. It'll give you a chance to chance implementations if you ever have to deploy on Windoze or something else.
Merry Christmas, Annie. Don't spend the day at the forum, as helpful as you are.

Sending down Linux commands from database

Hello
Im working with Oracle 10.2.0.4.3 on Linux SuSE FUSE Version 2.3.0-RC0-SL0/SLES-9.
Im currently doing an extract of BLOB files down to a directory on the server.
When I do the extract the Oracle user becomes the owner of the files and my own user doesn't have the access (neither read or write) to the files.
I cannot receive Oracle access due a security issue so Im wondering if its possible to send down a command from the database that does a
$chmod a+rw my_directory/*.* ?
Iv looked into the some forums and I didnt find anything in particulate that would help me, so Im wondering if any of you know if this is possible ?
BR / SA

Hello
Thank you for your advice but the question was to send down Linux commands from the DB, not do anything in the Linux enviroment.
Here is a good place to start that I found on the net.
public class JShellCommand {
public static int execute(String cmd) {
try
String[] shellCmd = { "/bin/sh", "-c", cmd };
Process process = Runtime.getRuntime().exec(shellCmd);
int exitVal = process.waitFor();
return (exitVal);
catch (Exception e)
return 1;
load it into db with loadjava and wrap it with:
CREATE OR REPLACE
FUNCTION Shell_Command(
p_CMD IN VARCHAR2
RETURN NUMBER
AS
LANGUAGE JAVA
NAME 'JShellCommand.execute(java.lang.String) return int';
For OS command you can use:
public class JCommand {
public static int execute(String cmd) {
try
Process process = Runtime.getRuntime().exec(cmd);
int exitVal = process.waitFor();
return (exitVal);
catch (Exception e)
return 1;
and
CREATE OR REPLACE
FUNCTION OS_Command(
p_Cmd IN VARCHAR2
RETURN NUMBER
AS LANGUAGE JAVA
NAME 'JCommand.execute(java.lang.String) return int';
/

Pls Send Usefull UNIX /LiNUX commands in SAP?

hi,
pls send me anybody what are the useful UNIX/LINUX commands in SAP.
regards,
reddy

Hi brother,
the following commands will help you do it and practice it give rewards....
Copy files one system to another system in network
#mount -t nfs <IPAddress> : /<Source Directory> /<Target Directory>
To Display Clock
#xclock
Check Process Details:
#top
#ps -ef | grep user/process/servicename
Check Memory Size:
#free
Check Disk space:
#df -k (in %)
#df -h (in GB)
Check Subdirectory files
#du /usr

Create .txt empty file After Message Processing Command Line Linux command

Hi All,
An empty .txt file has to be created in FTP location(FTP loc c:\xyz\Customer20082910.txt) only after the .dat file has been created(FTP loc c:\xyz\Customer20082910.dat)
Note:.dat has the actual data and .txt is an empty file and is created only after .dat is created
I know that .txt empty file can be created using the After Message Processing Command Line...
But confused which command to be given such that it will be created in the FTP location(c:\xyz\Customer20082910.txt)
Can any one please give the Linux command for it...
Regards,
Sridhar

Hi Aamir,
Thanks for the suggestion, I will ask my client to create a shell script at FTP server...
And one more question,
This is reverse side , now the .dat file is to be picked only if .txt exists at the FTP server (scenario File > XI>SAP) (earlier was SAP>XI>File)..
So please can you suggest for this also...
How can i check for the .txt and pick corresponding .dat file...
i had posted question long back
Need to pick .TXT file only if .CTL file is available
Regards,
Sridhar

Working Linux command to grep date range in a log file

Linux Gurus,
Could you please help me with command to show only those lines in a log file which falls under some date range, probably using grep command.
Our server logs are in following format <Jun 23, 2013 12:45:02 AM UTC>
Regards,
Varun

Perhaps you can do the following:
Go to Google.
Type "working Linux command to grep date range in a log file"
See what results you might get from that search. ( I did, and got more than 600,000 search results.)

String draw size, in a linux command environment

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