/usr/share/fish/functions/sgrep.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.
1 2 3 4 | function sgrep -d "Call grep without honoring GREP_OPTIONS settings"
set -l GREP_OPTIONS
command grep $argv
end
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