This file is indexed.

/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.

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_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