This file is indexed.

/etc/bash_completion.d/dhclient 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 dhclient

have dhclient && _dhclient()
{
    local cur prev

    COMPREPLY=()
    _get_comp_words_by_ref cur prev

    case $prev in
        -cf|-lf|-pf|-sf)
            _filedir
            return 0
            ;;
        -s)
            _known_hosts_real "$cur"
            return 0
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '-p -d -q -1 -r -lf -pf \
            -cf -sf -s -g -n -nw -w' -- "$cur" ) )
    else
        _available_interfaces
    fi
} &&
complete -F _dhclient dhclient

# 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