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    OLD       NEW       MERGED    UNCHANGED
    --------- --------- --------- ---------
    OCOMMAND  NCOMMAND  MCOMMAND           : Command line
    OFILE     NFILE     MFILE              : File name
    OMARK     NMARK     MMARK     UMARK    : Mark
    OLINE     NLINE     MLINE     ULINE    : Line number
    OTEXT     NTEXT     MTEXT     UTEXT    : Text

If UMARK and/or ULINE is empty, OMARK/NMARK and/or OLINE/NLINE are
used instead.

You can make multiple fields same color joining them by = :

    FIELD1=FIELD2=...=COLOR

Also wildcard can be used for field name :

    *CHANGE=BDw

Multiple fields can be specified by repeating options

    --cm FIELD1=COLOR1 --cm FIELD2=COLOR2 ...

or combined with comma (,) :

    --cm FIELD1=COLOR1,FIELD2=COLOR2, ...

Color specification is a combination of single uppercase character
representing 8 colors :

    R  Red
    G  Green
    B  Blue
    C  Cyan
    M  Magenta
    Y  Yellow
    K  Black
    W  White

and alternative (usually brighter) colors in lowercase :

    r, g, b, c, m, y, k, w

or RGB values and 24 grey levels if using ANSI 256 or full color
terminal :

    (255,255,255)      : 24bit decimal RGB colors
    #000000 .. #FFFFFF : 24bit hex RGB colors
    #000    .. #FFF    : 12bit hex RGB 4096 colors
    000 .. 555         : 6x6x6 RGB 216 colors
    L00 .. L25         : Black (L00), 24 grey levels, White (L25)

or color names enclosed by angle bracket :

    <red> <blue> <green> <cyan> <magenta> <yellow>
    <aliceblue> <honeydew> <hotpink> <moccasin>
    <medium_aqua_marine>

with other special effects :

    D  Double-struck (boldface)
    I  Italic
    U  Underline
    S  Stand-out (reverse video)

Above color spec is simplified summary so if you want complete
information, read L<Getopt::EX::Colormap>.

Defaults are :

    OCOMMAND => "555/010"  or "GS"
    NCOMMAND => "555/010"  or "GS"
    MCOMMAND => "555/010"  or "GS"
    OFILE    => "551/010D" or "GDS"
    NFILE    => "551/010D" or "GDS"
    MFILE    => "551/010D" or "GDS"
    OMARK    => "010/444"  or "G/W"
    NMARK    => "010/444"  or "G/W"
    MMARK    => "010/444"  or "G/W"
    UMARK    => ""
    OLINE    => "220"      or "Y"
    NLINE    => "220"      or "Y"
    MLINE    => "220"      or "Y"
    ULINE    => ""
    OTEXT    => "K/454"    or "G"
    NTEXT    => "K/454"    or "G"
    MTEXT    => "K/454"    or "G"
    UTEXT    => ""

This is equivalent to :

    sdif --cm '?COMMAND=555/010,?FILE=555/010D' \
         --cm '?MARK=010/444,UMARK=' \
         --cm '?LINE=220,ULINE=' \
         --cm '?TEXT=K/454,UTEXT='

=item B<--colormap>=C<&func>

=item B<--colormap>=C<sub{...}>

You can also set the name of perl subroutine name or definition to be
called handling matched words.  Target word is passed as variable
C<$_>, and the return value of the subroutine will be displayed.

See L<Getopt::EX::Colormap/FUNCTION SPEC> for detail.

=item B<-->[B<no->]B<cc>, B<-->[B<no->]B<commandcolor>

=item B<-->[B<no->]B<fc>, B<-->[B<no->]B<filecolor>

=item B<-->[B<no->]B<lc>, B<-->[B<no->]B<linecolor>

=item B<-->[B<no->]B<mc>, B<-->[B<no->]B<markcolor>

=item B<-->[B<no->]B<tc>, B<-->[B<no->]B<textcolor>

=item B<-->[B<no->]B<uc>, B<-->[B<no->]B<unknowncolor>

Enable/Disable using color for the corresponding field.

=back