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  1. #1

    Pipes question


    Hi,
    How exactly can I make the output of one program, the input of another program?


    Thanks!

  2. #2
    Hi REL,

    You can do this by using the pipe operator "|" (the vertical bar key on your keyboard). The general syntax is:

    Code:
    $ command1 | command2
    What happens is the standard output for command1 is piped to as the input for command2. For example, if you want to display a text file page by page on your terminal screen, you can do the following command:

    Code:
    $ cat {filename} | more

  3. #3
    Thanks, but this outputs the text the the second program only when the first program is terminated...
    I want the two programs run at the same time... and every character that the first program outputs immedietlly "becomes" the input of the second program, while the first program is still running.

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  5. #4
    Hi,

    Can you post what program you need to run and what output you are expecting?

  6. #5
    The two programs are not important... they are programs wich i wrote for my own needs in C...
    One is a console program (the "engine") and one is a GUI of that console program...
    I want them to communicate with each other so I thought this would be a good way... maybe im wrong.. :\
    Anyway, is what I asked for possible?

  7. #6
    In your case, an example of what you can do is, run the "engine" program from your GUI. Save the output of the "engine" program and let your GUI program read and display the output.

  8. #7
    If the "engine" program is a daemon which can communicate via sockets or IPC then you can use these methods to "talk" to the "engine"

  9. #8
    Quote Originally Posted by kihbord
    In your case, an example of what you can do is, run the "engine" program from your GUI. Save the output of the "engine" program and let your GUI program read and display the output.
    Thats what I want to do.
    But how exactly do I do that? :\

  10. #9
    One suggestion would be to use the exec() function in C to run the external program.

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