How to invoke command line programatically?

This is a discussion on How to invoke command line programatically? within the C Programming forums, part of the General Programming Boards category; Hello, I want to issue a command line command from c program? As an example, I want to run a ...

  1. #1
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    How to invoke command line programatically?

    Hello,

    I want to issue a command line command from c program?

    As an example, I want to run a program like mplayer.

    How can i do this?

    Regards.

  2. #2
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    Use the system() command in stdlib.h, for example:


    Code:
    system("ls");

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    Thank you.

    Is there a way to check if the statement execution is completed?

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    It appears like system() waits for the called process to finnish. This is from the man page.

    Quote Originally Posted by man page
    The system() function hands the argument command to the command interpreter sh(1). The
    calling process waits for the shell to finish executing the command, ignoring SIGINT and
    SIGQUIT, and blocking SIGCHLD.
    Other than that, I don't know. There might exist a more sophisticated method.

  5. #5
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    It's up to the implementation (and the command interpreter or shell) but system() often waits for the command to finish and returns the exit code from the program invoked.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

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    On Windows, never use system() (crappy and prohibited by MS)
    Use Shell apis

  7. #7
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    Quote Originally Posted by Alex31 View Post
    On Windows, never use system() (crappy and prohibited by MS)
    Use Shell apis
    Why do you think it's only crappy on Windows?

    "Prohibited by MS"?? Huh?
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

    "the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010

  8. #8
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    The return value of system() is the return code of the program which was executed. As long as the shell, and program, aren't brain-dead, this should be accurate. If system() returns 0, then the command executed successfully.

    Alex31, recommending a non-portable call when a portable one is perfectly sufficient is naive.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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