util-linux/bash-completion/whereis

_whereis_module()
{
	local cur prev OPTS
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-B'|'-M'|'-S')
			local IFS=$'\n'
			compopt -o filenames
			COMPREPLY=( $(compgen -o dirnames -- ${cur:-"/"}) )
			return 0
			;;
		'-h'|'-V')
			return 0
			;;
	esac
	case $cur in
		-*)
			OPTS="-b -B -m -M -s -S -f -u -l -g"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			return 0
			;;
	esac
	COMPREPLY=( $(compgen -c -- $cur) )
	return 0
}
complete -F _whereis_module whereis