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Thread: how to send out multiple commands using channel(exec)

  1. #1
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    Default how to send out multiple commands using channel(exec)

    Hi Folks,

    I am trying to send out multiple commands using the same channel and grab the out output stating whether the execution was succssful or not?
    But when I am trying to send out 2 commands in row, its not working.

    PLease find code below:
    package eclipsepackage;
     
    import java.io.IOException;
    import java.io.InputStream;
     
    import com.jcraft.jsch.ChannelExec;
    import com.jcraft.jsch.JSchException;
     
    //import IOExceptions;
     
    public class GetLastCommandStatus extends VerifyHostReachable
    {
    	 public int rVal = 0;
    	 public String cmd = "ls";
    	 public String cmd1 = "echo $?";
     
     
     
    	 public void cHKval() throws JSchException, IOException
    	 {
    	   ChannelExec channel3 = (ChannelExec) session.openChannel("exec");	
           channel3.setCommand(cmd ; cmd1); //cmd1 will only be run if the first command is successful
           channel3.setInputStream(null);
    	   InputStream in = channel3.getInputStream();
    	   channel3.connect();
           gLastCmdStatus(in,channel3); 
           channel3.disconnect();
           //channel3.setInputStream();
     
         }
     
     
    	private void gLastCmdStatus(InputStream in, ChannelExec channel3) throws IOException 
    	{
    		//byte[] b = new byte[10];
    		while (true)
    	    {
    	        while (in.available() > 0) 
    	        {
    	            System.out.println("Execution of last command was not successful;\n");
    	            byte[] tmp = new byte[1024];
    	            int i = in.read(tmp, 0, 1024);
    	            /*
    	              Number of bytes actually read is returned as an integer.
     
    	             */
    	            if (i < 0) 
    	            {
    	                break;
    	            }
    	            String line = new String(tmp, 0, i);
    	            System.out.println(line); 
     
    	        }
    	        if (channel3.isClosed())
    	        {
    	            break;
    	        }
    	        try 
    	        {
    	            Thread.sleep(1000);
    	        } 
    	        catch (Exception ee)
    	        {
    	            //ignore
    	        }
     
     
    	    }
        }
    }

    Its giving error when I am passing 2 commands in row...
    cmd1 will let me know the result of first cmd executed.

    Please let me know. Thanks in advance !!!



    Thanks,
    Asif Masood


  2. #2
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    Default How to pass multiple command using channel(exec) : Please solve my problem

    Hi Folks,

    I am trying to send out multiple commands using the same channel and grab the out output stating whether the execution was succssful or not?
    But when I am trying to send out 2 commands in row, its not working.

    PLease find code below:
    package eclipsepackage;
     
    import java.io.IOException;
    import java.io.InputStream;
     
    import com.jcraft.jsch.ChannelExec;
    import com.jcraft.jsch.JSchException;
     
    //import IOExceptions;
     
    public class GetLastCommandStatus extends VerifyHostReachable
    {
    	 public int rVal = 0;
    	 public String cmd = "ls";
    	 public String cmd1 = "echo $?";
     
     
     
    	 public void cHKval() throws JSchException, IOException
    	 {
    	   ChannelExec channel3 = (ChannelExec) session.openChannel("exec");	
           channel3.setCommand(cmd ; cmd1); //cmd1 will only be run if the first command is successful
           channel3.setInputStream(null);
    	   InputStream in = channel3.getInputStream();
    	   channel3.connect();
           gLastCmdStatus(in,channel3); 
           channel3.disconnect();
           //channel3.setInputStream();
     
         }
     
     
    	private void gLastCmdStatus(InputStream in, ChannelExec channel3) throws IOException 
    	{
    		//byte[] b = new byte[10];
    		while (true)
    	    {
    	        while (in.available() > 0) 
    	        {
    	            System.out.println("Execution of last command was not successful;\n");
    	            byte[] tmp = new byte[1024];
    	            int i = in.read(tmp, 0, 1024);
    	            /*
    	              Number of bytes actually read is returned as an integer.
     
    	             */
    	            if (i < 0) 
    	            {
    	                break;
    	            }
    	            String line = new String(tmp, 0, i);
    	            System.out.println(line); 
     
    	        }
    	        if (channel3.isClosed())
    	        {
    	            break;
    	        }
    	        try 
    	        {
    	            Thread.sleep(1000);
    	        } 
    	        catch (Exception ee)
    	        {
    	            //ignore
    	        }
     
     
    	    }
        }
    }

    Its giving error when I am passing 2 commands in row...
    cmd1 will let me know the result of first cmd executed.

    Please let me know. Thanks in advance !!!



    Thanks,
    Asif Masood

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: how to send out multiple commands using channel(exec)

    Duplicate threads merged.

    Have you read the API doc for the classes you are using? They are not part of the Java SE classes and there might not be anyone familiar with them.
    If you don't understand my answer, don't ignore it, ask a question.

  4. #4
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    Default Re: how to send out multiple commands using channel(exec)

    hello Norm,

    I didn't have any clue/idea under whose section I should put this thread, hence i put this in two different sections which I thought is nearer to thread.
    I don't have API doc for the class. How to find out what you are mentioning about !!


    Thanks in advance !!!

    Thanks,
    Asif

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: how to send out multiple commands using channel(exec)

    How to find out
    Use an internet search engine.
    Ask the people where you got the code that uses those classes.
    If you don't understand my answer, don't ignore it, ask a question.

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