/usr/share/vim/vim74/syntax/xxd.vim is in vim-runtime 2:7.4.1689-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | " Vim syntax file
" Language: bin using xxd
" Maintainer: Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
" Last Change: Oct 23, 2014
" Version: 8
" Notes: use :help xxd to see how to invoke it
" URL: http://www.drchip.org/astronaut/vim/index.html#SYNTAX_XXD
" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
syntax clear
elseif exists("b:current_syntax")
finish
endif
syn match xxdAddress "^[0-9a-f]\+:" contains=xxdSep
syn match xxdSep contained ":"
syn match xxdAscii " .\{,16\}\r\=$"hs=s+2 contains=xxdDot
syn match xxdDot contained "[.\r]"
" Define the default highlighting.
" For version 5.7 and earlier: only when not done already
" For version 5.8 and later: only when an item doesn't have highlighting yet
if version >= 508 || !exists("did_xxd_syntax_inits")
if version < 508
let did_xxd_syntax_inits = 1
command -nargs=+ HiLink hi link <args>
else
command -nargs=+ HiLink hi def link <args>
endif
HiLink xxdAddress Constant
HiLink xxdSep Identifier
HiLink xxdAscii Statement
delcommand HiLink
endif
let b:current_syntax = "xxd"
" vim: ts=4
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