This file is indexed.

/etc/bash_completion.d/update-alternatives is in bash-completion 1:1.3-1ubuntu8.

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

The actual contents of the file can be viewed below.

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# bash completion for update-alternatives

have update-alternatives && {
_installed_alternatives()
{
    local admindir
    # find the admin dir
    for i in alternatives dpkg/alternatives rpm/alternatives; do
        [ -d /var/lib/$i ] && admindir=/var/lib/$i && break
    done
    for (( i=1; i < COMP_CWORD; i++ )); do
        if [[ "${COMP_WORDS[i]}" == --admindir ]]; then
            admindir=${COMP_WORDS[i+1]}
            break
        fi
    done
    COMPREPLY=( $( compgen -W '$( command ls $admindir )' -- "$cur" ) )
}

_update_alternatives()
{
    local cur prev mode args i

    COMPREPLY=()
    _get_comp_words_by_ref cur prev

    case $prev in
        --altdir|--admindir)
            _filedir -d
            return 0
            ;;
        --help|--usage|--version)
            return 0
            ;;
    esac

    # find which mode to use and how many real args used so far
    for (( i=1; i < COMP_CWORD; i++ )); do
        if [[ "${COMP_WORDS[i]}" == --@(install|remove|auto|display|config|remove-all|set) ]]; then
            mode=${COMP_WORDS[i]}
            args=$(($COMP_CWORD - i))
            break
        fi
    done

    case $mode in
        --install)
            case $args in
                1|3)
                    _filedir
                    ;;
                2)
                    _installed_alternatives
                    ;;
                4)
                    # priority - no completions
                    ;;
                *)
                    case $((args % 4)) in
                        0|2)
                            _filedir
                            ;;
                        1)
                            COMPREPLY=( $( compgen -W '--slave' -- "$cur" ) )
                            ;;
                        3)
                            _installed_alternatives
                            ;;
                    esac
            esac
            ;;
        --remove|--set)
            case $args in
                1)
                    _installed_alternatives
                    ;;
                2)
                    _filedir
                    ;;
            esac
            ;;
        --auto|--remove-all|--display|--config)
            _installed_alternatives
            ;;
        *)
            COMPREPLY=( $( compgen -W '--verbose --quiet --help --version \
                --altdir --admindir --install --remove --auto --display \
                --config --set' -- "$cur" ) )
    esac
}
complete -F _update_alternatives update-alternatives alternatives
}

# Local variables:
# mode: shell-script
# sh-basic-offset: 4
# sh-indent-comment: t
# indent-tabs-mode: nil
# End:
# ex: ts=4 sw=4 et filetype=sh