Re: [JSch-users] How do you capture output of a command executed on Shell?

[Sergey G. <Sergey.Grinev@Sun.COM>]

You can just read from channel.getInputStream(). That's my code for 
running remote shell commands:

            try {
                channel = createChannel();
                InputStream is = channel.getInputStream();
                in = new BufferedReader(new InputStreamReader(is));
                out = new StringWriter();

                String line;
                while ((line = in.readLine()) != null || 
!channel.isClosed()) {
                    if (line != null) {
                        out.write(line + '\n');
                        out.flush();
                    }
                }
                in.close();
                is.close();
                setExitStatus(channel.getExitStatus());
            } catch (JSchException jse) {
                log.warning("Jsch failure during running " + cmd);
            } catch (IOException ex) {
                log.warning("IO failure during running " + cmd);
            } finally {
                disconnect();
            }

Mike V wrote:
> How do you capture output of a command executed on Shell, and how do 
> you know if it is done executing?
>
> I need this because some programs look for variables set by the 
> .profile (ksh).
>
>
> This is how I'm doing it now:
> -open Shell channel and send a ByteArrayInputStream that contains my 
> command, while outputing to a tmpfile.txt
> -sleep for a bit and then (this is because i dont know when my command 
> is done running.. this is a retarded way of doing it since some 
> commands take a lot longer than others)
> -open another channel(Exec) and send "cat tmpfile.txt" then read the 
> input stream
> -remove the temp file
>
>
>
> ********************start of sample code**********
>
>     commandToRun=commandToRun + " > "+tempFile+"\n";
>     byte[] bytes = commandToRun.getBytes();
>     ByteArrayInputStream bais=new ByteArrayInputStream(bytes);
>
> try {  ..... //session connection stuff
>         .....
>       
>         Channel channel=session.openChannel("shell");
>         ((ChannelShell)channel).setInputStream(bais);
>         channel.connect();
>
>         try{Thread.sleep(1500);}catch(Exception ee){} 
>
>         Channel channel2=session.openChannel("exec");
>         ((ChannelExec)channel2).setCommand("cat "+tempFile+"\n");     
>         InputStream in1=channel2.getInputStream();
>         channel2.connect();
>
>         //channel 3 deletes the temp file
>
> **********************end of sample code **************************
>
>
>
> There must be a better way of doing this...
> What about a way to know when the command is done? Since the first 
> channel is a shell, i dont think you can wait for is to be .isClosed() 
> since it never is.
>
> Thank you very much for your help.
>
>
> Mike
>
>
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