Howto: Change users password in Linux with Java

something like code below is not working:

has anyone here ever executed passwd this way successfully?

String[] callAndArgs = { "passwd",

"ehsan" };

try {

String line = null;

Process child = rt.exec(callAndArgs);

System.out.println("111");

BufferedReader br = new BufferedReader( new InputStreamReader(

child.getInputStream() ) );

BufferedWriter bw = new BufferedWriter( new OutputStreamWriter(

child.getOutputStream() ) );

System.out.println(br.readLine() );

bw.write( "password" );

System.out.println(br.readLine() );

bw.write( "password" );

System.out.println( "Data : " + br.readLine() );

System.out.println( "DEBUGGER" );

child.destroy();

br.close();

bw.close();

System.out.println("Process exit code is: " + child.exitValue());

}

catch(IOException e) {

System.err.println(

"IOException starting process!");

}

MarshallAVT at 2007-7-6 14:07:44 >

My problem is in executing passwd, and im asking if anyone has ever written a program in java to change user acounts passwords using passwd command

I cant get the output of "passwd"command and I cant send any streams to the command

String[] callAndArgs = { "passwd",

"poli" };

Process child = rt.exec(callAndArgs);

InputStream stdin = child.getInputStream();

InputStreamReader isr = new InputStreamReader(stdin);

BufferedReader br = new BufferedReader(isr);

InputStream stderr = child.getErrorStream();

InputStreamReader isr2 = new InputStreamReader(stderr);

BufferedReader br2 = new BufferedReader(isr2);

while ( (line = br.readLine()) != null) // not working -- program halts here

System.out.println(line); // not working

OutputStream os = child.getOutputStream();

PrintWriter pw = new PrintWriter(os);

pw.println ("password");// not working

pw.flush();

MarshallAVT at 2007-7-6 14:07:44 >

> My problem is in executing passwd, and im

> asking if anyone has ever written a program in java to

> change user acounts passwords using passwd command

>

> I cant get the output of "passwd"command and I cant

> send any streams to the command

Searching the forums suggest that, as the previous reply suggests, that command does not use stdin/out (nor does su.)

Suggested solutions were to create a script file or to use JNI. I didn't see anything that suggested those would work but rather that they might.

jschell at 2007-7-6 14:07:44 >