c shell scripting!!

This is a discussion on c shell scripting!! within the Linux Programming forums, part of the Platform Specific Boards category; does a system call return value?? if not how would i get the menu choice to return some value Code: ...

  1. #1
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    Apr 2005
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    6

    c shell scripting!!

    does a system call return value??

    if not how would i get the menu choice to return some value
    Code:
    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #define script "dialog --backtitle \"Linux Shell Script Tutorial\" \
    --title \"Main Menu\" --menu \
    \"Move using [UP] [DOWN],[Enter] to Select\" 15 50 3\
    1 \"Shows Date and Time\" 2 \"To see calendar\" 3 \"To start vi editor\" "
    
    
    
    int main(int arg1, char *arg2[])
    {
    int a;
    a=system(script);
    printf("hello");
    printf("%d",a);
    return 0;
    }
    thanks for your time

  2. #2
    Registered User major_small's Avatar
    Join Date
    May 2003
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    Quote Originally Posted by http://www.cppreference.com/stdother/system.html
    The system() function runs the given command as a system call. The return value is usually zero if the command executed without errors. If command is NULL, system() will test to see if there is a command interpreter available. Non-zero will be returned if there is a command interpreter available, zero if not.
    Why not just use mostly C?
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    int main(int arg1, char *arg2[])
    {
    	int a;
    	printf("Linux Shell Script Tutorial\n");
    	printf("Main Menu:\n");
    	printf(" [1] Show Date and Time\n [2] See Calendar\n [3] Start Vi\n");
    	printf("Please Choose a number: ");
    	scanf("%d",&a);
    	
    	if(a==1)
    	{
    		system("date");
    	}
    	else if(a==2)
    	{
    		system("cal");
    	}
    	else
    	{
    		system("vi");
    	}
    	
    	return 0;
    }
    also, avoid using system() - it opens your program up to security breaches.
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  3. #3
    Just kidding.... fnoyan's Avatar
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    >also, avoid using system() - it opens your program up to security breaches

    Sure...You should use fork()-execv() for exexcutin a command within your program.

    You may want to see your system's manual page for system() call.

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