Running a command in Linux

Hi expert,

I wrote this java class, it works on Windows, but not Linux.

Seems not to run the code you have any idea why?

(1) you provide a userlogin
(2) check if the userlogin file exists
(3) otherwise it create a file whose name and content would be the userlogin.

for example, you provide 'John', and it will create/home/oracle/JOHN that contains the string 'JOHN '.


Thank you

import java.io.*;

public class RemoteScript {
     static String mDirectoryPath = "/home/oracle/";
     static String mCompleted = "COMPLETED";
     static String mError = "ERROR";
     
     private static boolean checkFile(String pFileName) {
          File f = new File(pFileName);
          return (f.exists() ? true : false);
     }
     
     private static boolean execute(String pInstruction) {
          boolean oResult=false;
          int exitVal = -1;
          try {
               Runtime rt = Runtime.getRuntime();
               Process proc = rt.exec(pInstruction);
               BufferedReader br = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
               String line;
               while ((line = br.readLine()) != null) {
                    System.out.println(line);
               }
               exitVal = proc.waitFor();
               if(exitVal==0)
                    oResult=true;
               } catch (Throwable t) {
                    t.printStackTrace();
               }
          return oResult;
     }
     
     public static String createUser(String pLogin) {
          String oFileName = mDirectoryPath + pLogin.toUpperCase();
          if (!checkFile(oFileName)) {
               String oInstruction = "/bin/echo " + pLogin.toUpperCase() + " > "+ oFileName;
               execute(oInstruction);
               if (checkFile(oFileName)){
                    return mCompleted;
               }
               else{
                    return mError + ".NT";
               }
          } else
               return mError + ".EX";
     }
     
     public static void main(String[] args) {
          createUser("SAMPLEUSER");
     }
}
Published by: sabre150 on February 21, 2012 17:06
Moderator action: {code} tags added

I don't understand how this code can work under windows but...

You have a fundamental misunderstanding. Under Linux the ">" operator must be interpreted by a shell. This means that you must use the version of the table of Runtime.exec () and make your order

           String[] oInstruction = {"bash", "-c","/bin/echo " + pLogin.toUpperCase() + " > " + oFileName};

Replace your execute() method to get the signature

   private static boolean execute(String[] pInstruction)

You manage also not "stderr" process flow at all. You should read http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html and apply ALL the recommendations. Otherwise you can cause a significant loss of hair.

P.S. I used 'bash' but you are free to use any shell you want, but make sure you read the appropriate shell manual page.

Published by: sabre150 on February 21, 2012 17:23

Tags: Java

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