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Thread: Invoke a linux shell command using Process

  1. #1
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    Default Invoke a linux shell command using Process

    Hi every body,

    I am trying to execute this commad (/usr/bin/rrdtool lastupdate my_rrdfile_path) in java by Runtime.getRuntime.exe().
    executing this command in linux shell will return some status of my system. but when I execute it by java, it returns null!
    here is some part of my program:

     
                    String rrdCmd = "/usr/bin/rrdtool lastupdate " + rrdPath;
                    String temp = null;
    		String cmdStResult = null;			
    		Process p = null;
     
    		try {
    			p = Runtime.getRuntime().exec(rrdCmd);
    			int exitVal = p.waitFor();
    			System.out.println("exitVal of rrdLastUpdate is : " + exitVal);
     
    		     } catch (Exception e) {
     
    			System.out.println("Problem in exec()");
    			e.printStackTrace();
     
    			}//end of try-catch
     
     
     
    		try {				
     
    				InputStreamReader inStreamReader = new InputStreamReader(p.getInputStream());
    				BufferedReader stdInput = new BufferedReader(inStreamReader);
     
    				while ((s = stdInput.readLine()) != null) {
    					System.out.println(s);					
    				}//end of while
     
                          } catch (Exception ex) {
    				System.out.println("problem!");
    				ex.printStackTrace();
    		      }//end of try-catch


    I thought this forum is most related to my question!
    sorry if my english is poor
    any guidance would be appreciated
    thanks a lot.


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: Invoke a linux shell command using Process


  3. #3
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    Default Re: Invoke a linux shell command using Process


  4. The Following User Says Thank You to copeg For This Useful Post:

    masoumeh (June 27th, 2013)

  5. #4
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    Default Re: Invoke a linux shell command using Process

    sorry, I did not know these rules. thanks for your mention.
    excuse me. because I should solve this problem as quickly as possible and nobody answered me here, I asked it in another forum. but actually I didn't know this isn't right.
    every body should forgive me

  6. #5
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    Default Re: Invoke a linux shell command using Process

    can I ask my question any forum else by linking to here?
    now what can I do, when no answer is available

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