实验一命令解释程序的编写

一、目的和要求

1. 实验目的

（1）掌握命令解释程序的原理；

（2）*掌握简单的DOS调用方法；

（3）掌握C语言编程初步。

2．实验要求

编写类似于DOS，UNIX的命令行解释程序

（1）自行定义系统提示符

（2）自定义命令集（8-10个）

（3）用户输入HELP以查找命令的帮助

（4）列出命令的功能，区分内部还是外部命令

（5）用户输入QUIT退出

（6）内部命令有dir, cd, md, rd, cls, date, time, ren, copy等。

二、实验内容

根据教师指定的实验课题，完成设计、编码、测试工作。

三、实验环境

1．PC微机

2．Windows 操作系统

3．C/C++程序开发集成环境

四、实验原理及核心算法参考程序段

命令解释程序的原理：

命令解释程序的主要功能是：

1) 接受和执行一条用户从键盘输入的命令，它通常保存一张命令名字（动词）表，其中记录着所有操作命令及其处理程序的入口地址或有关信息。

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<string.h>
 4 
 5 #define MAXLINE 1000
 6 #define N 100
 7 #define Head1 "Microsoft Windows XP [版本 5.1.2600]"
 8 #define Head2 "<C> 版权所有 1985-2001 Microsoft Corp."
 9 #define Head3 "C:\Documents and Settings\Administrator>"
10 
11 
12 void FakeTopTitle()
13 {    
14     printf(Head1"
");
15     printf(Head2"
");
16     printf("
");
17     //printf(Head3);
18 }
19 
20 /*
21 void ReadFromDocument()
22 {
23     FILE *fp;
24     char arr[MAXLINE+1];
25     printf("
");
26     if ((fp = fopen ("CommandLine.txt", "r")) == NULL)
27     {
28          perror ("File open error!
");
29          exit (1);
30     }
31     while ((fgets (arr, MAXLINE, fp)) != NULL)
32     {
33         fputs (arr, stderr);
34     }
35     printf("

");
36     printf(Head3);
37 }    
38 */
39 /*
40 void Test()
41 {
42     char s[200][200] = {0};
43     int i=0;
44     FILE *fp;
45     fp = fopen("CommandLine.txt","r");
46     printf("
");
47     for(i=0;i<200;i++)
48     {
49         fscanf(fp,"%s",s[i]);
50         printf("%s
",s[i]);
51     }
52 }
53 */
54 
55 int main()
56 {
57     int i;
58     char a[100][100]={"assoc","attrib","break","bootcfg","cacls","call","cd","chcp","chdir",
59                     "chkdsk","chkntfs","cls","cmd","color","comp","compact","convert",
60                     "copy","date","del","dir","diskcomp","diskcopy","diskpart","doskey",
61                     "driverquery","echo","endlocal","erase","eventquery","fc",
62                     "find","for","format","fsutil","ftype","goto","gpresult","help","if",
63                     "label","md","mkdir","mode","more","move","openfiles","pagefileconfig",
64                     "path","pause","popd","print","prompt","pushd","rd","recover","rem",
65                     "ren","rename","replace","rmdir","set","setlocal","sc","schtasks",
66                     "shift","shutdown","sort","start","subst","systeminfo","tasklist",
67                     "taskkill","time","title","tree","type","ver","verify","vol","xcopy",
68                     "wmic"};
69     char b[100];
70     FakeTopTitle();
71 loop1:printf(Head3);
72       gets(b);
73     for(i=0;i<N;i++)
74     {
75             if(strcmp(a[i],b)==0)
76             {
77                 system(b);
78                 printf("
");
79                 printf(Head3);
80                 getchar();
81             }
82             else
83             {
84                 break;
85             }
86             if(strcmp(b,"exit")==0)
87             {
88                 exit(0);
89                 getchar();
90             }
91     }
92     system(b);
93     goto loop1;
94     getchar();
95     return 0;
96 }

实验一 命令解释程序的编写

一、目的和要求

二、实验内容

三、实验环境

四、实验原理及核心算法参考程序段

实验一命令解释程序的编写