zzddiiffff [[--bbddeeffhh]] [[--cc _s_y_m_b_o_l]] _f_i_l_e_1 _f_i_l_e_2zdiff compares two compressed text files, and outputs a summary of their differences. It behaves exactly the same as diff, except that it de- compresses compressed files ``on the fly.'' For details on the options to zdiff see the Lexicon entry for diff.