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groff_diff (7)
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    NAME

    groff_diff - differences between GNU troff and classical troff
    
     
    

    DESCRIPTION

    This manual page describes the language differences between groff, the GNU roff text processing system and the classical roff formatter of the freely available Unix~7 of the 1970s, documented in the Troff User's Manual by Osanna and Kernighan. This inludes the roff language as well as the intermediate output format (troff output). The section SEE ALSO gives pointers to both the classical roff and the modern groff documentation.  

    GROFF LANGUAGE

    In this section, all additional features of groff compared to the classical Unix~7 troff are described in detail.  

    Long names

    The names of number registers, fonts, strings/:macros/:diversions, special characters (glyphs), and colors can be of any length. In escape sequences, additionally to the classical (xx construction for a two-character name, you can use [xxx] for a name of arbitrary length.
    [rs][xxx]
    Print the special character (glyph) called xxx.
    [rs][comp1 comp2 ...]
    Print composite glyph consisting of multiple components. Example: `[rs][A~ho]' is capital letter A with ogonek which finally maps to glyph name `u0041_0328'. See the groff info file for details how a glyph name for a composite glyph is constructed, and groff_char(7) for list of glyph name components used composite glyph names.
    [rs]f[xxx]
    Set font xxx. Additionally, [rs]f[] is a new syntax equal to [rs]fP, i.e., to return to the previous font.
    [rs]*[xxx arg1 arg2 ...]
    Interpolate string xxx, taking arg1, arg2, ... as arguments.
    [rs]n[xxx]
    Interpolate number register xxx.
     

    Fractional pointsizes

    A scaled point is equal to 1/sizescale points, where sizescale is specified in the DESC file (1 by default). There is a new scale indicator z that has the effect of multiplying by sizescale. Requests and escape sequences in troff interpret arguments that represent a pointsize as being in units of scaled points, but they evaluate each such argument using a default scale indicator of z. Arguments treated in this way are the argument to the ps request, the third argument to the cs request, the second and fourth arguments to the tkf request, the argument to the [rs]H escape sequence, and those variants of the [rs]s escape sequence that take a numeric expression as their argument. For example, suppose sizescale is 1000; then a scaled point will be equivalent to a millipoint; the call .ps 10.25 is equivalent to .ps 10.25z and so sets the pointsize to 10250 scaled points, which is equal to 10.25 points. The number register [rs]n[.s] returns the pointsize in points as decimal fraction. There is also a new number register [rs]n[.ps] that returns the pointsize in scaled points. It would make no sense to use the z scale indicator in a numeric expression whose default scale indicator was neither u nor z, and so troff disallows this. Similarly it would make no sense to use a scaling indicator other than z or u in a numeric expression whose defaulSegmentation fault (core dumped)
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