This file is indexed.

/usr/share/bash-completion/completions/mkswap is in util-linux 2.25.2-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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_mkswap_module()
{
	local cur prev OPTS
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-p'|'--pagesize')
			COMPREPLY=( $(compgen -W "bytes" -- $cur) )
			return 0
			;;
		'-L'|'--label')
			COMPREPLY=( $(compgen -W "label" -- $cur) )
			return 0
			;;
		'-v'|'--swapversion')
			COMPREPLY=( $(compgen -W "1" -- $cur) )
			return 0
			;;
		'-U'|'--uuid'|'-h'|'--help'|'-V'|'--version')
			return 0
			;;
	esac
	case $cur in
		-*)
			OPTS="--check --force --pagesize --label --swapversion --uuid --version --help"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			return 0
			;;
	esac
	local IFS=$'\n'
	compopt -o filenames
	COMPREPLY=( $(compgen -f -- $cur) )
	return 0
}
complete -F _mkswap_module mkswap