/usr/share/fish/functions/ll.fish is in fish-common 2.4.0-1.
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 | #
# These are very common and useful
#
function ll --description "List contents of directory using long format"
ls -lh $argv
end
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