/usr/share/fish/functions/grep.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Match colors for grep, if supported
#
if command grep --color=auto --help 1>/dev/null 2>/dev/null
function grep
command grep --color=auto $argv
end
end
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