Paste: 123

/**
 * Simple shell interface program.
 *
 * Operating System Concepts - Ninth Edition
 * Copyright John Wiley & Sons - 2013
 */

#include <stdio.h>
#include <unistd.h>
#include <string.h>


#define MAX_LINE		80 /* 80 chars per line, per command */

int main(void)
{
	char *args[MAX_LINE/2 + 1];	/* command line (of 80) has max of 40 arguments */
    int should_run = 1;
		
    while (should_run){   
        printf("osh>");
        fflush(stdout);
        char line[MAX_LINE];
        gets(line);
        char *p = NULL;
        int num = 0;
        for(p = strtok(line, " "); p != NULL; p = strtok(NULL, " "))
        {
            args[num] = p;
            num++;
        }
        args[num] = NULL;
        pid_t pid = fork();
        if(pid == 0){
            execvp(args[0], args);
        }
        else{
            
        }
        /**
         * After reading user input, the steps are:
         * (1) fork a child process
         * (2) the child process will invoke execvp()
         * (3) if command included &, parent will invoke wait()
         */
    }
    
}