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getcwd/getwd : È¡µÃĿǰËùÔÚĿ¼  
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char * getcwd(char *buf,size_t size);  
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#include   
char *getwd(char *buf);  
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//»ñȡϵͳĿ¼×î´ó³¤¶È
long pathconf(char* path, int flag);
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chdir/fchdir/chroot : ¸Ä±äĿǰËùÔÚĿ¼  
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#include   
int chdir(const char * pathname);  
int fchdir(int fd);  
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if(chdir("..")==-1){
        perror("Couldn't change current working directory.\n");
        return 1;
    }
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int chroot(const char * path);  
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