/usr/share/fish/functions/la.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 la --description "List contents of directory, including hidden files in directory using long format"
ls -lah $argv
end
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