Thread: subsitution for rcmd -> local command

  1. #1
    Registered User
    Join Date
    May 2008

    Question subsitution for rcmd -> local command

    hi everyone,

    I m looking for a subsitution for rcmd(). i want make a client server application run on a standalone machine.

    currently i am going with unix file sockets to replace rcmd() for creating a scoket connection.

    my doubts are:
    1. is there only one stdin, stdout and strerr sockets for a linux machine or if we open different termnals then will those terminals have their own stdin, stdout, stderr soket descriptors

    2. Is it possible for a program running in one terminal to copy the standard io descriptors of other terminal.

    3.can a program runnin in one terminal send data to the stdin descriptor of other terminal

    i tried doing it but the parent prints the data in its own terminal not in client terminal

  2. #2
    Officially An Architect brewbuck's Avatar
    Join Date
    Mar 2007
    Portland, OR
    You can invoke processes on a remote machine and display their output on the client terminal by using ssh or rsh:

    system("ssh username@hostname /path/to/command");
    Or for rsh:

    system("rsh hostname -l username /path/to/command");

  3. #3
    Registered User
    Join Date
    May 2008

    but the system is a blocking call and usin ssh or rsh wont help.,.

    actually what i ws lookin for ws the exact opposite of rcmd something like local command.

    as i have an server client program which i want to run on a standalone machine.

    so finally got sucessful

    what i did is created a UNIX file socket betwwen a server and a client program, and then on the client side closed the sdtin and sdtout descriptors and dupped then to the socket descriptor which i have created so now i dont need to change anythin else in my code .

    so what i hv learned is

    1. if u want to take out the network part in some server client application use unix file socket

    2. if lookin for rcmd subsitute, somethin lik lcmd just do whatever i did.

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