/usr/share/vim/vim74/syntax/crontab.vim is in vim-runtime 2:7.4.052-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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" Language: crontab
" Maintainer: David Necas (Yeti) <yeti@physics.muni.cz>
" Original Maintainer: John Hoelzel johnh51@users.sourceforge.net
" License: This file can be redistribued and/or modified under the same terms
" as Vim itself.
" Filenames: /tmp/crontab.* used by "crontab -e"
" Last Change: 2012-05-16
"
" crontab line format:
" Minutes Hours Days Months Days_of_Week Commands # comments
" 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
syntax match crontabMin "^\s*[-0-9/,.*]\+" nextgroup=crontabHr skipwhite
syntax match crontabHr "\s[-0-9/,.*]\+" nextgroup=crontabDay skipwhite contained
syntax match crontabDay "\s[-0-9/,.*]\+" nextgroup=crontabMnth skipwhite contained
syntax match crontabMnth "\s[-a-z0-9/,.*]\+" nextgroup=crontabDow skipwhite contained
syntax keyword crontabMnth12 contained jan feb mar apr may jun jul aug sep oct nov dec
syntax match crontabDow "\s[-a-z0-9/,.*]\+" nextgroup=crontabCmd skipwhite contained
syntax keyword crontabDow7 contained sun mon tue wed thu fri sat
syntax region crontabCmd start="\S" end="$" skipwhite contained keepend contains=crontabPercent
syntax match crontabCmnt "^\s*#.*" contains=@Spell
syntax match crontabPercent "[^\\]%.*"lc=1 contained
syntax match crontabNick "^\s*@\(reboot\|yearly\|annually\|monthly\|weekly\|daily\|midnight\|hourly\)\>" nextgroup=crontabCmd skipwhite
syntax match crontabVar "^\s*\k\w*\s*="me=e-1
" 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_crontab_syn_inits")
if version < 508
let did_crontab_syn_inits = 1
command -nargs=+ HiLink hi link <args>
else
command -nargs=+ HiLink hi def link <args>
endif
HiLink crontabMin Number
HiLink crontabHr PreProc
HiLink crontabDay Type
HiLink crontabMnth Number
HiLink crontabMnth12 Number
HiLink crontabMnthS Number
HiLink crontabMnthN Number
HiLink crontabDow PreProc
HiLink crontabDow7 PreProc
HiLink crontabDowS PreProc
HiLink crontabDowN PreProc
HiLink crontabNick Special
HiLink crontabVar Identifier
HiLink crontabPercent Special
" comment out next line for to suppress unix commands coloring.
HiLink crontabCmd Statement
HiLink crontabCmnt Comment
delcommand HiLink
endif
let b:current_syntax = "crontab"
" vim: ts=8
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