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  1. #1
    Sebaslott is offline Member
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    Default Problem with shell cmd in a JAVA api

    Hi, is a pleassure for me belong to the community.

    Well, I have a problem when I want to execute a shell cmd in a JAVA api.
    I want to execute: "echo -n 0 > /dev/motor" to a device, but when I write "echo", this show in the console " 0 > /dev/motor"
    doesn't execute the command in the device file.

    this is the instruction in the code that I wrote:

    Process p = Runtime.getRuntime().exec("echo 0 > /dev/motor");

    Is there another way to write into the device file, without use "echo"?


    P.D.
    Sorry for my english.

  2. #2
    Junky's Avatar
    Junky is offline Grand Poobah
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    Default

    Not sure what you are trying to do but all the echo command does is echo(reprints) the text back to the screen. Which is exactly what you observed.

  3. #3
    Sebaslott is offline Member
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    With the ">" I redirect the "-n 0" to a device file "/dev/motor". I have been create that device file to handle a device.
    So, if a write into the device file "echo -n 0 > /dev/motor" directly from the console, I don't have any problem, cause doesn't show me in the screen that arguments, if it does in the device file.
    But when I use that command from the Java api, shows me in the screen, not in the device file the arguments.

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