1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <sys/types.h> 4 #include <sys/wait.h> 5 #include <unistd.h> 6 #include <string.h> 7 #define M ‘>‘ 8 void word_search(char *line,char *word[1024]); 9 int main(int argc,char *argv[])10 {11     char line[1024];12     char *word[1024];13     while(memset(line,0,1024),printf("%c",M),fgets(line,1024,stdin))14     {    15         if(line[0]==‘\n‘)16             continue;17         line[strlen(line)-1]=‘\0‘;18         memset(word,0,sizeof(word));19         word_search(line,word);20         if(word[0]==NULL)21             continue;22         if(fork() == 0)23         {24             execvp(word[0],word);25             continue;26         }27         else28             wait(NULL);29     }30     return 0;31 }32 void word_search(char *line,char *word[1024])33 {34     int cnt=0,bg=0,end;35     while(line[bg] != ‘\0‘)36     {37         while(line[bg] == ‘ ‘ && line[bg]!=‘\0‘)38             bg++;39         if(line[bg]==‘\0‘)40             break;41         end=bg;42         while(line[end]!=‘ ‘&& line[end]!=‘\0‘)43             end++;44         word[cnt]=(char *)calloc(1,(end-bg+1));45         strncpy(word[cnt],line+bg,end-bg);46         cnt++;47         bg=end;48     }49     word[cnt]=NULL;50 }