jsch = new JSch();
session = jsch.getSession(userName, ip, 22);
session.setPassword(passWord);

session.connect();
channel = session.openChannel("shell");
expect = new Expect(channel.getInputStream(), channel.getOutputStream());
((ChannelShell) channel).setPtyType("dumb");
channel.connect();
System.out.println("After channel and expect");
if (expect.expect("#") > -1) {
    output = "Connected";
} else {
    output = "Unexpected Prompt";
    System.out.println("Unexpected Prompt");
}
expect.send("top" + "\n");
Thread.sleep(3000);
System.out.println("inside top");
OutputStream out = channel.getOutputStream();
out.write(3); // send CTRL-C
out.flush();
Sy,stem.out.println("exit1");
if (expect.expect("$") > -1) {
    System.out.println("finding $");
    contt = (expect.before);
    if (contt != null && contt != "") {
       output=StringUtils.replace(contt,"\"","");
        System.out.println("afterline"+output);
    } else {
        contt="Error in Top Check";
        System.out.println("Error in Top check");
    }
} else {
    System.out.println("oit");
}

Mientras ejecuto este código, obtengo resultados

[H[J[mtop - 05:54:39 up 53 days, 15:21, 22 users,  load average: 0.44, 0.80, 0.76[m[K
Tasks:[m[m 443 [mtotal,[m[m   1 [mrunning,[m[m 442 [msleeping,[m[m   0 [mstopped,[m[m   0 [mzombie[m[K
Cpu(s):[m[m  2.8%[mus,[m[m  0.8%[msy,[m[m  0.1%[mni,[m[m 95.9%[mid,[m[m  0.3%[mwa,[m

como estos. Estoy obteniendo personajes no deseados junto con él. ¿Cómo puedo eliminarlos?