vertx shell, how to run custom commands?

[Buddha Shrestha]

Hi all, 

I wanted to run some shell commands using vertx application (eg: rm -rf, cp, pwd etc). So, to start off I tried to run top command from: https://github.com/vert-x3/vertx-examples/blob/master/shell-examples/src/main/java/io/vertx/example/shell/top/TopCommand.java

But, it didn't show any output on the console, even if I pressed ctrl-c.

Also, I tried doing pwd :

Command starwars = CommandBuilder.command("pwd").

        processHandler(process -> {

          process.write("present directory:");

          process.end();

        }).build(vertx);

    ShellService service = ShellService.create(vertx, new ShellServiceOptions().setTelnetOptions(

        new TelnetTermOptions().setHost("localhost").setPort(3000)

    ));

    CommandRegistry.getShared(vertx).registerCommand(starwars);

    service.start(ar -> {

      if (!ar.succeeded()) {

        ar.cause().printStackTrace();

      } else {

        System.out.println("successfully executed..");

      }

    });

The processHandler is not called here.

So, am I missing out on something? What should be the right way to execute custom shell commands?

[Julien Viet]

the commands are to be executed from the shell itself when you connect via telnet or SSH.

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[Buddha Shrestha]

Thanks Julien for clearing it out, I had misunderstood its purpose.

Also, are there any alternatives to execute commandline commands like cp /* /destination, rm -rf /destination ...etc. 

I know Vertx Filesystem is an alternative for this, but it does not support wildcard inputs, causing many preprocessing to be done. 

Thanks,

[Julien Viet]

it should be supported in the vertx shell cp command I think

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[Buddha Shrestha]

Are there any examples that I could refer to? I have not been able to execute vertx shell.

That would be a great help.

Thanks,

[Julien Viet]

here are all of them : https://github.com/vert-x3/vertx-examples/tree/master/shell-examples/src/main/java/io/vertx/example/shell

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[Buddha Shrestha]

Julien,

I ran the example of TopCommand, but even if I telnet locahost 3000, I donot get any response.

Plus, I want to execute commandline commands without any external triggers, within my application.

Previously, used the NuProcess :https://github.com/brettwooldridge/NuProcess

and upon search, I found that you have created your own project based on it : https://github.com/vietj/vertx-childprocess

Using NuProcess, I sometimes got exceptions that would kill my process -- which was very scary thing for me.

So, I was thinking about changing the implementation where I found VertxFileSystem and VertxShell.

So, could you please suggest what should i do? 

PS: The exceptions thrown by NuProcess that terminates the process are always when I try to do : rm -rf /destination.

Thanks,

[Julien Viet]

you can run commands programmatically : it is explained in this section http://vertx.io/docs/vertx-shell/java/#_shell_server

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