COLCRT(1) UNIX Programmer's Manual COLCRT(1) NNAAMMEE colcrt - filter nroff output for CRT previewing SSYYNNOOPPSSIISS ccoollccrrtt [ -- ] [ --22 ] [ file ... ] DDEESSCCRRIIPPTTIIOONN _C_o_l_c_r_t provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstriking is destructive. Half-line characters and underlining (changed to dashing `-') are placed on new lines in between the normal output lines. The optional -- suppresses all underlining. It is especially useful for previewing _a_l_l_b_o_x_e_d tables from _t_b_l(1). The option --22 causes all half-lines to be printed, effec- tively double spacing the output. Normally, a minimal space output format is used which will suppress empty lines. The program never suppresses two consecutive empty lines, how- ever. The --22 option is useful for sending output to the line printer when the output contains superscripts and sub- scripts which would otherwise be invisible. A typical use of _c_o_l_c_r_t would be tbl exum2.n | nroff -ms | colcrt - | more SSEEEE AALLSSOO nroff/troff(1), col(1), more(1), ul(1) BBUUGGSS Should fold underlines onto blanks even with the `--' option so that a true underline character would show; if we did this, however, _c_o_l_c_r_t wouldn't get rid of _c_u'_d underlining completely. Can't back up more than 102 lines. General overstriking is lost; as a special case `|' over- struck with `-' or underline becomes `+'. Lines are trimmed to 132 characters. Some provision should be made for processing superscripts and subscripts in documents which are already double-spaced. Printed 7/9/88 May 7, 1986 1