This chapter explains some key differences between the Cygwin environment and traditional UNIX systems. It assumes a working knowledge of standard UNIX commands. DOCTOOL-INSERT-using-pathnames DOCTOOL-INSERT-using-textbinary DOCTOOL-INSERT-using-filemodes DOCTOOL-INSERT-using-specialnames DOCTOOL-INSERT-using-cygwinenv DOCTOOL-INSERT-ntsec DOCTOOL-INSERT-using-cygserver DOCTOOL-INSERT-using-utils DOCTOOL-INSERT-using-effectively