how to execute commands from java

[peczcyberworld]

hi,
i m trying to execute a CVS command from a java environment. i m
writing this code to create a user. for this i m executing this cvs
command "cmd /c cvs passwd -r <username> -a <new-username>"
after executing this cmd the command prompt will prompt for a pasword
and then after entring the password i have to retype the password for
confirmation. the existing code execcutes the command but i don t know
how to read the prompt for password.
<code>
import java.io.*;
import java.lang.*;

public class first {
public static void main(String[] args) {
try {
Process p = Runtime.getRuntime().exec("cmd /c cvs passwd -r
gopalakrishnan_k -a ram");
InputStreamReader reader=new InputStreamReader(System.in);
BufferedReader OptFromCmd = new BufferedReader(new InputStreamReader(
p.getInputStream()));

BufferedReader fromKeyboard = new BufferedReader(reader);
BufferedReader stdError = new BufferedReader(new InputStreamReader(
p.getErrorStream()));
OutputStream stdOut = p.getOutputStream();
String s;
String pswd = "mahesh";
System.out.println("Success");

int i = 0;

while ((s = OptFromCmd.readLine()) != null) {
//s = OptFromCmd.readLine();
i++;
System.out.println(s);

System.out.println(i);

if (i > 1) {
stdOut.write(pswd.getBytes());
stdOut.flush();
}

}

System.out.println(
"Here is the standard error of the command (if any):\n");

while ((s = stdError.readLine()) != null) {
System.out.println(s);
}

/* Your Password Here */
String password="Password Please";
stdOut.write(password.getBytes());
stdOut.flush();
stdOut.write(password.getBytes());
stdOut.flush();
/* Your Password here */

OptFromCmd.close();
stdError.close();
stdOut.close();
} catch (Exception e) {

e.printStackTrace();
}
}
}

</code>

[o/p]

this program gives the output as
adding the user <username>
password:

now i need to enter the password from java envronment and provide it
in the command prompt .
then it prompts for the password again for confirmation so i have to
retype the password again
how to acheive this.

 

[jon]

hi,
i m trying to execute a CVS command from a java environment. i m
writing this code to create a user. for this i m executing this cvs
command "cmd /c cvs passwd -r <username> -a <new-username>"
after executing this cmd the command prompt will prompt for a pasword
and then after entring the password i have to retype the password for
confirmation. the existing code execcutes the command but i don t know
how to read the prompt for password.
<code>
import java.io.*;
import java.lang.*;

public class first {
public static void main(String[] args) {
try {
Process p = Runtime.getRuntime().exec("cmd /c cvs passwd -r
gopalakrishnan_k -a ram");
InputStreamReader reader=new InputStreamReader(System.in);
BufferedReader OptFromCmd = new BufferedReader(new InputStreamReader(
p.getInputStream()));

BufferedReader fromKeyboard = new BufferedReader(reader);
BufferedReader stdError = new BufferedReader(new InputStreamReader(
p.getErrorStream()));
OutputStream stdOut = p.getOutputStream();
String s;
String pswd = "mahesh";
System.out.println("Success");

int i = 0;

while ((s = OptFromCmd.readLine()) != null) {
//s = OptFromCmd.readLine();
i++;
System.out.println(s);

System.out.println(i);

if (i > 1) {
stdOut.write(pswd.getBytes());
stdOut.flush();

}
}

System.out.println(
"Here is the standard error of the command (if any):\n");

while ((s = stdError.readLine()) != null) {
System.out.println(s);

}

/* Your Password Here */
String password="Password Please";
stdOut.write(password.getBytes());
stdOut.flush();
stdOut.write(password.getBytes());
stdOut.flush();
/* Your Password here */

OptFromCmd.close();
stdError.close();
stdOut.close();

} catch (Exception e) {

e.printStackTrace();

}
}
}

</code>

[o/p]

this program gives the output as
adding the user <username>
password:

now i need to enter the password from java envronment and provide it
in the command prompt .
then it prompts for the password again for confirmation so i have to
retype the password again
how to acheive this.

p.getInputStream() will get you the stdIn for the cmd process, in the
same way as p.getOutput stream gets you the output stream.

not sure if that answers your question
btw you may need to thread the input to the inputStream of the process
cus reading process output stream can block.

 

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

i m trying to execute a CVS command from a java environment. i m
writing this code to create a user. for this i m executing this cvs
command "cmd /c cvs passwd -r <username> -a <new-username>"
after executing this cmd the command prompt will prompt for a pasword
and then after entring the password i have to retype the password for
confirmation. the existing code execcutes the command but i don t know
how to read the prompt for password.

Instead off running an EXE why not try with a pure Java implementation
of CVS.

Google finds:

http://www.jcvs.org/
http://javacvs.netbeans.org/library/

Arne