This file is indexed.

/etc/bash_completion.d/procps 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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# Completions for tools included in procps and related

# killall(1) (Linux and FreeBSD) and pkill(1) completion.
#
[[ $UNAME == Linux || $UNAME == FreeBSD ]] || have pkill &&
_killall()
{
    local cur

    COMPREPLY=()
    _get_comp_words_by_ref cur

    if [[ $COMP_CWORD -eq 1 && "$cur" == -* ]]; then
        _signals
    else
        _pnames
    fi

    return 0
}
[[ $UNAME == Linux || $UNAME == FreeBSD ]] && complete -F _killall killall
have pkill && complete -F _killall pkill

# pgrep(1) completion.
#
[ $UNAME = Linux ] || have pgrep &&
_pgrep()
{
    local cur

    COMPREPLY=()
    _get_comp_words_by_ref cur

    _pnames

    return 0
}
have pgrep && complete -F _pgrep pgrep

# Linux pidof(8) completion.
[ $UNAME = Linux ] && complete -F _pgrep pidof

# 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