TAC(1L) TAC(1L) NNAAMMEE tac - concatenate and print files in reverse SSYYNNOOPPSSIISS ttaacc [-br] [-s separator] [--before] [--regex] [--separa- tor=separator] [--help] [--version] [file...] DDEESSCCRRIIPPTTIIOONN This manual page documents the GNU version of ttaacc. ttaacc copies each given file, or the standard input if none are given or when a file name of `-' is encountered, to the standard output with the order of the records reversed. The records are separated by instances of a string, or a newline if none is given. By default, the separator string is attached to the end of the record that it fol- lows in the file. OOPPTTIIOONNSS _-_b_, _-_-_b_e_f_o_r_e The separator is attached to the beginning of the record that it precedes in the file. _-_r_, _-_-_r_e_g_e_x The separator is a regular expression. _-_s_, _-_-_s_e_p_a_r_a_t_o_r _s_e_p_a_r_a_t_o_r Use _s_e_p_a_r_a_t_o_r as the record separator. _-_-_h_e_l_p Print a usage message and exit with a non-zero sta- tus. _-_-_v_e_r_s_i_o_n Print version information on standard output then exit. FSF GNU Text Utilities 1 .