java - Removing shell stuff (like prompts) from command output in JSch

Question

I have successfully SSH'ed into a node, sent the input, and retrieved the output. After inputting a line, the line is printed to the console, followed by a blank line, and then the output prints twice. I don't want the input to print to the console after it is entered, nor the blank line, nor the output printed a second time. Below is the code I have

public void runSession() {
    try {
        Channel channel = session.openChannel("shell");
        channel.setInputStream(System.in, true);
        channel.setOutputStream(System.out, true);
        channel.connect(defaultChannelTimeout);

        while (channel.getExitStatus() == -1) {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                System.out.println(e);
            }
        }

        channel.disconnect();
    } catch(JSchException jschEx) {
        System.out.println("JSch exception during I/O");
        System.out.println(jschEx.getMessage());
    }
}

Here is what the console looks like when running

user:domain@node:/a/b/c> cd ..

cd ..

user:domain@node:/a/b> user:domain@node:/a/b>

As you can see, there are issues:

• The "cd.." is printed on a line to the console by itself
• A blank line appears after the "cd.."
• The "user:domain@node:/a/b>" line is printed twice.

Does anyone know how I can remove these 3 items from being displayed in the console? Desired output is

user:domain@node:/a/b/c> cd..

user:domain@node:/a/b>

Answer 1

These are all consequences of the "shell" channel.

You run an interactive session with all the fancy stuff that human users like.

The "shell" channel is not intended for automation.

You may remove some of these by calling channel.setPty(false) before channel.connect().

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Though you better use the "exec" channel.

This may work:

( echo username & echo password & echo hostname ) | command

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