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

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# xrdb(1) completion

have xrdb &&
_xrdb()
{
    COMPREPLY=()
    local cur prev
    _get_comp_words_by_ref cur prev

    case $prev in
        -backup|-display|-help)
            return 0
            ;;
        -cpp|-edit)
            _filedir
            return 0
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '-help -display -all -global -screen -screens
            -n -quiet -cpp -nocpp -symbols -query -load -override -merge
            -remove -retain -edit -backup' -- "$cur" ) )
        return 0
    fi

    _filedir
} &&
complete -F _xrdb xrdb

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