I have a shell script which does some basic functions and calls the c program with specific command line arguments for each operation.
The C program returns integer value indicating success or failure.
Now I have a situation, where the c program needs to couple of values and that needs to be accessed by the parent script. Is there any way this can be achieved? [Apart from storing the value in a temporary file and the script accessing the file to get the value]
Let your C program write the values to its stdout, and use the command substitution shell feature to capture those values in the parent script, along the lines of
program_output=$(your_c_program with the arguments it needs)
man bash (and search for command substitution) for details.
You can use the excecl command
int execl(const char *path, const char *arg, ...);
Like so:
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
void main () {
return execl ("/bin/pwd", "pwd", NULL);
}
yes there is, take a look at the exec system call, there are multiple functions that can help you achieve this, but basically you can execute a c program and pass it all arguments you want/need
