int main(int argc,char *argv[])
{
    while(1)
    {
        printf("lb@lb-virtualbox:~$ ");
        ReadCommand();
        AnalysisCommand();
        DoCommand();
    }
    return 0;
}
void ReadCommand()
{
    char a;
    int i=0;
    while(scanf("%c",&a)!EOF&&a!='\n'&&i<256)
    {
        command[i]=a;
        i++;
    }
    command[i]=0;
}
void AnalysisCommand()
{
    int i=0,j=0;
    int flag=0;
    for(int k=0,k<strlen(command);k++)
    {
        if(command[k]==' '||command[k]=='\t')
        {
            if(flag==0)
            {
                par[i][j]=0;
                i++;
                j=0;
                flag=1;
            }
        }
        else
        {
            par[i][j]=command[i];
            j++;
            flag=0;
        }
    }
    if(flag==1)
    {
        par[i][j]=0;
        i++;
        par[i][0]=0;
    }
}
void CreatFile()
{
    int tt;
    char path[255];
    getcwd(path,255);
    strcat(path,"/");
    strcat(path,par[1]);
    tt=syscall(SYS_creat,path,6666);
    syscall(SYS_close,tt);
}
void ShowFile()
{
    char path[255];
    FILE *fp;
    char c;
    getcwd(path,255);
    strcat(path,"/");
    stract(path,par[1]);
    if((fp=fopen(path,"r"))==NULL)
    printf("打不开文件\n");
    while((c=fgetc(fp))!=EOF)
    printf("%c",c);
}
void CopyFile()
{
    char oldpath[100],newpath[100];
    FILE *oldfp,*newfp;
    char c;
    getcwd(oldpath,100);
    getcwd(newpath,100);
    stract(oldpath,"/");
    stract(oldpath,par[1]);
    stract(newpath,"/");
    stract(newpath,par[2]);

    if((oldfp=fopen(oldpath,"r"))==NULL)
    printf("打不开原文件\n");

    if((newfp=fopen(newpath,"w"))==NULL)
    printf("新文件创建失败\n");
    while((c=fgetc(oldfp))!=EOF)

    fputc(c,newfp);
    fclose(oldfp);

    fclose(newfp);
}
int DeleteFile()
{
    char path[255];
    getcwd(path,255);
    stract(path,"/");
    stract(path,par[1]);
    if(remove(path)==0)
    return 0;
}
void ShowDir()
{
    DIR* dirp;
    struct dirent * ent;
    if(strcmp("",par[1])==0)
    dirp=opend(".");
    else dirp=opendir(par[1]);
    while((ent=readdir(dirp))!=NULL)
    {
        if(ent->d_name[0]!='.')
        printf("%s\t",ent->d_name);
    }
    printf("\n");
    closedir(dirp);
}
int DoCommand()
{
    if(strcmp("ShowDir",par[0])==0)
    {
        ShowDir();
        return 0;
    }
    else if(strcmp("CreatFile",par[0])==0)
    {
        CreatFile();
        return 0;
    }
    else if(strcmp("ShowFile",par[0])==0)
    {
        ShowFile();
        return 0;
    }
    else if(strcmp("CopyFile",par[0])==0)
    {
        CopyFile();
        return 0;
    }
    else if(strcmp("DeleteFile",par[0])==0)
    {
        DeleteFile();
        return 0;
    }
    else 
    {
        char *p;
        char d[]=" ";
        int n=1,i=1;
        char q[100][100];
        char **a;
        strcopy(q[0],strtok(command,d));
        while(p=strtok(NULL,d))
        {
            strcpy(q[i++],p);
            n++;
        }
        a=malloc(sizeof(char *)*n+1);
        for(int i=0;i<n+1;i++)
        {
            a[i]=malloc(sizeof(char)*100);
            if(i<n)
            strcpy(a[i],q[i]);
        }
        a[n]==NULL;
        if(fork()==0)
        {
            if(execvp(a[0],a)<0)
            {
                printf("失败\n");
                return -1;
            }
        }
        else
        {
            int pidReturn =wait(NULL);
        }
        free(a);
    }
}