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/etc/bash_completion.d/apache2ctl is in bash-completion 1:1.3-1ubuntu8.

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The actual contents of the file can be viewed below.

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# apache2ctl(1) completion

have apache2ctl && {
_apache2ctl() {
    local APWORDS cur

    COMPREPLY=()
    _get_comp_words_by_ref cur

    APWORDS=$(apache2ctl 2>&1 >/dev/null | awk 'NR<2 { print $3; exit }' | \
        tr "|" " ")

    COMPREPLY=( $( compgen -W "$APWORDS" -- "$cur" ) )
}
complete -F _apache2ctl apache2ctl
}

# 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