Feedback from runtime.exec(command)
Hi,
I hope someone can point out the problem with the following. I have a method that is supposed to execute a shell command. The shell command would look something like the following:
serctl add 351 password [email protected]
However when this command is executed in a shell/command line a prompt is shown ("MySql password:")asking for a password. Once the user enters the password, the user is added. My code currently executes the first half of the command but gets stuck on the password prompt. My code stops by the line "before the loop" and never enters the inner loop. So obviously my code isn't working properly to say that if the response is a password prompt, to pass it the password variable.
Any ideas?
Many Thanks.
void addUser(String username, String password, String email, String passwd, HttpServletResponse response) throws IOException {
String[] command = {"serctl", "add", username, password, email};
//String[] command = {"pstree"};
Runtime runtime = Runtime.getRuntime();
Process process = null;
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
String s = "something";
try {
process = runtime.exec(command);
System.out.println("Process is: " + process);
System.out.println("Command is: " + command);
BufferedReader in =
new BufferedReader(new InputStreamReader(process.getInputStream()));
BufferedReader error = new BufferedReader(new InputStreamReader(process.getErrorStream()));
OutputStream stdout = process.getOutputStream();
System.out.println("before the loop");
s=in.readLine();
System.out.println(s);
System.out.println(s);
System.out.println(in);
System.out.println(stdout);
//while((s=in.readLine())!= null)
while((s=in.readLine()).equals("MySql password: "))
//s = in.readLine();
System.out.println(in.readLine());
System.out.println(s);
out.println(s);
if (s.equals("MySql password: ")) {
System.out.println("Must be equal to MySql password;");
//stdout.write(passwd.getBytes());
//stdout.write(adminpassword);
//stdout.flush();
//break;
System.out.println("after the loop");
System.out.println("Here is the standard error of the command(if any):\n");
while ((s = error.readLine()) != null){
System.out.println(s);
stdout.close();
in.close();
error.close();
out.println(in);
out.println("<html>");
out.println("<body bgcolor=\"#FFFCCC\">");
out.println("You have successfully added a new user.<br><br>");
out.println("User " + username + " has been created ");
out.println("</body></html>");
catch (Exception e) {
System.out.println("Uh oh! Error adding new user.");
e.printStackTrace();
}
Just a random observation:
Sometimes programs that prompt for passwords do it in a way that is impossible to redirect (or at least requires special trickery, such as creating a pseudo-TTY). E.g. in Unix this involves opening /dev/tty and using that instead of stdout & stdin. This is done to make sure there really is a person who knows the password sitting there in front of the teletype.
I don't know if the "serctl" program does that. If stdout&stdin redirection does not appear to work then it is a possibility.
A quick googling for "serctl" reveals:
Commands labeled with (*) will prompt for a MySQL password.
If the variable PW is set, the password will not be prompted.
which might or might not be an easier way to deal with this particular program. If it indeed is the same "serctl" program.
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see code below,
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-IsmAvatarYoungWinston
YoungWinston wrote:
IsmAvatar wrote:
However, for one particular user, using Mac OS X, he has reported the following output:One particular user, or all users on Mac OS?In this case, I have two mac users. One is reporting that all works fine. The other is reporting this problem.
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Andrew Thompson
Andrew Thompson wrote:
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jschell
jschell wrote:
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Execute java class from a batch file called from runtime.exec
Hi.
I don´t know if this question fits here.
I wan´t to execute a batch file (on Win XP) with runtime.exec. That batch file will execute another java program.
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import java.io.IOException;
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java Lanzador %1 %2 %3Lanzador.java
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Edited by: ragsger on Dec 22, 2008 12:59 PM
Edited by: ragsger on Dec 22, 2008 1:00 PMReplacing $BLAH with the value of the environment variable BLAH is handled by the shell and since you don't call a shell, you'll have to do that on your own.
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at java.lang.Runtime.exec(Unknown Source)
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InputStream is;
String type;
StreamGobbler(InputStream is, String type)
this.is = is;
this.type = type;
public void run()
try
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + ">" + line);
} catch (Exception ioe)
ioe.printStackTrace();
private void jMenuItem13ActionPerformed(java.awt.event.ActionEvent evt) {
Object source = evt.getSource();
String serverComm;
serverComm = "";
serverComm = pp.getServerComm();
if(source == jMenuItem13)
try
String osName = System.getProperty("os.name");
Runtime rt = Runtime.getRuntime();
Process commandReturn = rt.exec(serverComm + " /usr/local/bin/dlgexec pd_rm_cm trashcan");
//StreamGobbler errorGobbler = new
//StreamGobbler(commandReturn.getErrorStream(), "ERROR");
StreamGobbler outputGobbler = new
StreamGobbler(commandReturn.getInputStream(), "OUTPUT");
//errorGobbler.start();
outputGobbler.start();
int exitVal = commandReturn.waitFor();
System.out.println("exitVal = " + exitVal);
if(exitVal == 0)
System.out.println("inside the trashcan if");
int cnt = 0;
String outText []= new String [10000];
BufferedReader buffy = new BufferedReader(new InputStreamReader(outputGobbler.is));
while((outText[cnt]=buffy.readLine()) != null)
cnt++;
if(cnt == 9000)
break;
TextAreaPanel tp;
tp = new TextAreaPanel();
for(int cnt2 = 0; cnt2 < cnt; cnt2++)
String temp;
temp = outText[cnt2] + "\n";
tp.setPaneText(temp);
jPanel1.removeAll();
jPanel1.add(tp, BorderLayout.CENTER);
jPanel1.validate();
this.repaint();
catch(Throwable t)
t.printStackTrace();
and here is the method that I call
public void setPaneText(String message)
jTextArea1.setEnabled(true);
//jTextArea1.setEditable(false);
String outText = message;
jTextArea1.setText(message);
jScrollPane1.setViewportView(jTextArea1);
//return outText;
String message;@Op. Please learn how to use code formatting when you post code:
http://forum.java.sun.com/help.jspa?sec=formatting -
I'm trying to run following command with Runtime.exec:
rsync -auz sourceHost:'path1 path2' tmpSo I have following code to run this command:
command[0] = "rsync";
command[1] = "-auz";
command[2] = "sourceHost:'path1 path2'";
command[3] = "tmp";
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(command);
InputStream stdin = proc.getErrorStream();
InputStreamReader isr = new InputStreamReader(stdin);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ( (line = br.readLine()) != null) {
System.out.println(line);
stdin = proc.getInputStream();
isr = new InputStreamReader(stdin);
br = new BufferedReader(isr);
line = null;
while ( (line = br.readLine()) != null) {
System.out.println(line);
int exitVal;
try {
exitVal = proc.waitFor();
} catch (InterruptedException e) {
throw new IOException(e.getMessage());
if (exitVal != 0) {
throw new IOException("Exit value was " + exitVal + " that means an error occured" +
" during rsync call");
}What happens is that when I run the code rsync gives me following error:
rsync: link_stat "path1 path2" failed: No such file or directory (2)
rsync error: some files could not be transferred (code 23) at main.c(812)
client: nothing to do: perhaps you need to specify some filenames or the --recursive option?
java.io.IOException: Exit value was 23 that means an error occured during rsync call
at RSyncTest.rsyncBinaryData(RSyncTest.java:156)
at RSyncTest.main(RSyncTest.java:80)Can anyone think of what's wrong here?
Regards and Thanks,
DavidIn Java version 1.3 (and later) method exec() of class Runtime returns a Process instance when invoked. The process object returned is what you need to manage.
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