Hello, I am trying to as the title says within linux environment within my C program this is what I have so far:

int file_out = open(filename_var,O_RDWR|O_CREAT);

if((child_pid = fork()) >= 0) /* successful fork */
{
	if(child_pid == 0) { /* Child process */
		close(1);
		dup(file_out);
		close(file_out);

		f(execvp(command_var,command_args) == -1) {
			printf("command not found\n");
		}

		_exit(0);
	}
	else { /* Parent Process */
		waitpid(-1,&status,0);
	}
}
else { /* fork() call unsuccessful */
	perror("fork");
}

It works how I want it to by the fact that it redirects the output to the filename given in filename_var but for some reason it also prints out some extra data, for example if I type 'echo helloworld > newfile.txt' within my program, it will write to the file correctly but then it'll also print out "helloworld > newfile.txt" to stdout. I am not sure what the problem may be, I tried using fflush() but it didn't work. I am not sure what the problem may be, thanks.

Maybe, you're receiving in stdin the output generated by the execution of the proccess.

Try to close stdin also... only guessing.

In my view the usage 'echo helloworld > newfile.txt' within a 'C' program is limiting the redirection operator and as a result it is also being treated as as a simple '>' text character, which on echo prints the output 'helloworld > newfile.txt' to the stdout.

You need to look through this...