-/// get the current working directory
-std::string const getcwd();
-/// change to a directory, 0 is returned on success.
-int chdir(std::string const & name);
-/**
- * rename a file, returns false if it fails.
- * It can handle renames across partitions.
- */
-bool rename(std::string const & from, std::string const & to);
-/// copy a file, returns false it it fails
-bool copy(std::string const & from, std::string const & to);
-/// generates a checksum of a file
-unsigned long sum(std::string const & file);