运行环境Ubuntu-Linux
代码如下：
1 #include <unistd.h> 2 #include <string.h> 3 #include <stdio.h> 4 #include <wait.h> 5 #include <stdlib.h> 6 #define MAX_LINE 80 7 typedef struct hst{ 8 int number; 9 char *hst_cmd[MAX_LINE/2 + 1]; 10 int len; 11 struct hst *next; 12 13 }HstList; 14 void outHst(HstList *p); 15 void reLoad(int n, char *a[], HstList *p, int *num); 16 int main(void){ 17 char *args[MAX_LINE/2 + 1]; 18 int should_run = 1; 19 int waitFlag = 1;//flag of wait, 1 represent the father need to wait 20 int retype = 0;//flag of retype command 21 int hst_num = 1;//init the HstList 22 HstList *head, *node, *end, *latest; 23 head = (HstList*)malloc(sizeof(HstList)); 24 head->number = 0; 25 end = head; 26 latest = head; 27 end->next = NULL; 28 29 while(should_run){ 30 printf("myCommand(input 'exit' to exit)>>"); 31 fflush(stdout); 32 33 //read every input 34 int num = 0; 35 while(1){ 36 char *tmp = (char*)malloc(50*sizeof(char)); 37 if((scanf("%s", tmp)) == EOF || getchar() == '\n'){ 38 args[num] = tmp; 39 if(strcmp(args[num], "!!") == 0){ 40 if(latest->number == 0) printf("***you have not input any command recently!***:(\n"); 41 else{ 42 reLoad(end->number, args, head, &num); 43 break; 44 } 45 retype = 1; 46 break; 47 } 48 if(args[num][0] == '!' && args[num][1] != '!'){ 49 char *n = &args[num][1]; 50 int index = atoi(n); 51 if( index < head->number || index > end->number) printf("***the command not found!***:(\n"); 52 else{ 53 reLoad(index, args, head, &num); 54 break; 55 } 56 retype = 1; 57 break; 58 } 59 60 if(strcmp(args[num], "history") == 0){ 61 if(latest->number == 0) printf("***you have not input any command!***:(\n"); 62 else{ 63 while(latest != NULL){ 64 outHst(latest); 65 latest = latest->next; 66 } 67 latest = head->next;//when it print out the history, it should be reset 68 } 69 retype = 1; 70 break; 71 } 72 if(strcmp(args[num], "&") == 0){ 73 args[num] = NULL; 74 waitFlag = 0; 75 break; 76 } 77 if(strcmp(args[num], "exit") == 0){//set the flag of end 78 should_run = 0; 79 break; 80 } 81 args[++num] = NULL;//the end of args should be NULL 82 break; 83 }//for delay to close input 84 args[num] = tmp; 85 num++; 86 } 87 if(retype == 1){ 88 retype = 0; 89 continue; 90 } 91 if(should_run == 0) break;//stop run 92 93 //put the command into history 94 node = (HstList*)malloc(sizeof(HstList)); 95 end->next = node; 96 end = node; 97 end->next = NULL; 98 node->number = hst_num; 99 node->len = num; 100 hst_num++; 101 for(int i = 0;i <= node->number;i++) node->hst_cmd[i] = args[i]; 102 int i; 103 latest = head; 104 for(i = 0;i < 10;i++){ 105 if((end->number - i) > 1) continue; 106 else{ 107 latest = head->next; 108 break; 109 } 110 } 111 if(i == 10)//latest point to the latest 10 history command 112 while(latest->number != (end->number - 9)) 113 latest = latest->next; 114 115 //fork a process and insert a program into it 116 int pid; 117 pid = fork(); 118 if(pid < 0){ 119 printf("***process creation failed!***:(\n"); 120 } 121 else if(pid == 0){ 122 execvp(args[0], args); 123 printf("***command execution failed!***:(\n");//if the command execute successfully,there will not be returned value, or error occurred 124 exit(1); 125 } 126 else{ 127 if(waitFlag == 1){ 128 wait(NULL); 129 sleep(1); 130 } 131 printf("***parent program finished!***:)\n"); 132 } 133 134 } 135 return 0; 136 } 137 138 void outHst(HstList *p){ 139 printf("%d ", p->number); 140 for(int i = 0;i < p->len;i++) 141 printf("%s ", p->hst_cmd[i]); 142 printf("\n"); 143 } 144 void reLoad(int n, char *a[], HstList *p, int *num){ 145 while(p->number != n) p = p->next; 146 for(int i = 0;i <= p->len;i++){ 147 a[i] = p->hst_cmd[i]; 148 } 149 *num = p->len; 150 }