/usr/share/bash-completion/completions/ctrlaltdel is in util-linux 2.29.2-1+deb9u1.
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 9 10 11 12 13 14 15 16 17 | _ctrlaltdel_module()
{
local cur prev
COMPREPLY=()
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[COMP_CWORD-1]}"
case $prev in
'-h'|'--help'|'-V'|'--version')
return 0
;;
esac
if [ $COMP_CWORD -eq 1 ]; then
COMPREPLY=( $(compgen -W "hard soft" -- $cur) )
fi
return 0
}
complete -F _ctrlaltdel_module ctrlaltdel
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