/usr/share/fish/completions/pkill.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 5 6 7 8 | __fish_complete_pgrep pkill
__fish_make_completion_signals
for i in $__kill_signals
set number (echo $i | cut -d " " -f 1)
set name (echo $i | cut -d " " -f 2)
complete -c pkill -o $number -d $name
complete -c pkill -o $name -d $name
end
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