running unix command from java


 
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# 1  
Old 07-09-2012
[SOLVED] running unix command from java

Hi All,

I have been struggling for a week trying to run a unix command from my java program.

the unix command is:
Code:
ssh dmdev3@tsapid01-zt3d01 ':> /t3/envs/dmdev3/test/file_list.txt'

when i try to run this command directly on my unix console, it works perfectly.

but when i try it form my JAVA program, i get the below mentioned error

Code:
ksh: :> /t3/envs/dmdev3/test/file_list.txt:  not found

SmilieSmilieSmilie

below is my java code snippet that i use,
Code:
procTemp=runEnv.exec(strShellCmd);

where strShellCmd contains the entire unix command as a single string


requiring your help at the earliest cause i'm in such a desperate situation.

Thanks in advance,
Madhu.


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.

Last edited by zaxxon; 07-09-2012 at 08:56 AM.. Reason: code tags, see PM!
# 2  
Old 07-09-2012
Please don't cross post the same question across multiple forums, it dilutes effort.
# 3  
Old 07-09-2012
i am sorry. was a bit confused on the correct location of the topic.
rest assured it wont happen again. Smilie
# 4  
Old 07-09-2012
Quote:
where strShellCmd contains the entire unix command as a single string
Let's see that line too.
First impression is that the command would be better placed in Shell Script.

What (in words) are you expecting the command to do. It appears to just execute a null command on a remote server.
# 5  
Old 07-09-2012
The /t3/envs/dmdev3/test/file_list.txt file is (should be) cleared by this command.
# 6  
Old 07-09-2012
Code:
private boolean executeShell(String strShellCmd) {
        try {
            procTemp=runEnv.exec(strShellCmd);

            //read the output from shell console
            BufferedReader brShellOP = new BufferedReader(
                    new InputStreamReader(procTemp.getInputStream()));
            String strShellOP = null;
            while ((strShellOP = brShellOP.readLine()) != null) {
                System.out.println(strShellOP);
            }
            brShellOP.close();

            // catch error from shell console (if any)
            BufferedReader brShellError = new BufferedReader(
                    new InputStreamReader(procTemp.getErrorStream()));
            String strShellError = null;
            while ((strShellError = brShellError.readLine()) != null) {
                System.out.println(strShellError);
            }
            brShellError.close();

            // wait for the process to finish
            try {
                intExitVal = procTemp.waitFor();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
            
            //returns false if shell console throws error
            if(intExitVal!=0){
                return false;
            }
            return true;

        } catch (IOException ioEx) {
            System.out.println("error in executeShell().IOException");
            ioEx.printStackTrace();
            return false;
        }
    }

this is the entire method that does the execute operation.
Let me know if you require any other inputs for getting my issue solved.

PS: i'm new to this executing-unix-from-java thing.

Thanks a tonne,
Madhu.
# 7  
Old 07-09-2012
Use cp /dev/null /t3/envs/dmdev3/test/file_list.txt
 
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