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i need help with this code please

1 reply on 1 page. Most recent reply: May 25, 2002 8:15 AM by Thomas SMETS

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patrick

Posts: 23
Nickname: patrick
Registered: Mar, 2002

i need help with this code please

Posted: May 23, 2002 10:43 PM

i have a class that take a shell command as an argument and try to execute it
but i'm having a IOException java.lang.UNIXProcess.ForkAndExec....
when i try to execute the command cd
(i want to cd /etc/mail than execute make)
this the code:

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.util.*;
import java.io.*;
import java.lang.*;

public class User
{

public static String adduser(String[] cmd)
{ String line;
String output =null;
try
{

StringBuffer buffer=new StringBuffer();

Runtime rt=Runtime.getRuntime();
Process process=rt.exec(cmd);
InputStreamReader isr=new InputStreamReader(process.getInputStream());
BufferedReader br=new BufferedReader(isr);
while ((line=br.readLine())!=null)
{
buffer.append(line);

}

int exitValue=process.waitFor();
System.out.println("ExitValue:"+exitValue);
output =buffer.toString();
}
catch(Throwable t)
{
t.printStackTrace();
}
return output;
}

public static void main(String[] argv)
{
User user=new User();
String[] cmd=new String[2];
cmd[0]="cd /etc/mail";
cmd[1]="make";
//cmd[2]="make";
user.adduser(cmd);
}

}

can anyone have an answer to this problem please

Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Re: i need help with this code please

Posted: May 25, 2002 8:15 AM

Patrick,
Should you look at this instead
<snip>

Process exec(String[] cmdarray, String[] envp, File dir)

Executes the specified command and arguments in a separate process with the specified environment and working directory. </snip> ?

The only trouble with this solution is that it is available from the JDK 1.3 onwards, while you may be working with the JDK 1.2 ?

Thomas SMETS,
SCJP2 - Brussels

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