COLCRT(1) COLCRT(1) NAME colcrt - filter nroff output for CRT previewing SYNOPSIS colcrt [ - ] [ -2 ] [ file ... ] DESCRIPTION _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 -2 causes all half-lines to be printed, effectively double spacing the output. Normally, a minimal space output format is used which will suppress empty lines. The program never suppresses two con‐ secutive empty lines, however. The -2 option is useful for sending output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible. A typical use of _c_o_l_c_r_t would be tbl exum2.n | nroff -ms | colcrt - | more SEE ALSO nroff/troff(1), col(1), more(1), ul(1) BUGS 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 ‘|’ overstruck with ‘-’ or underline becomes ‘+’. Lines are trimmed to 132 characters. Some provision should be made for processing superscripts and sub‐ scripts in documents which are already double-spaced. 3rd Berkeley Distribution May 7, 1986 COLCRT(1)