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;
}

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thanks for your time

Quote:

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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.

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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;
}

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also, avoid using system() - it opens your program up to security breaches.

>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.