bug#34225: 27.0.50; Add passwd backups to etc-passwd-generic-mode

[Glenn Morris]

Eli Zaretskii wrote:

>> I don't know why backups /etc/passwd- use the suffix '-' instead of '~'
>
> It does?  I seem to be unable to reproduce this:
>
>   (make-backup-file-name "/etc/passwd")
>     => "/etc/passwd~"
>
> What am I missing?

These are non-Emacs backups. See eg "man 5 shadow".
 
    /etc/shadow-
    Backup file for /etc/shadow.
    
    Note that this file is used by the tools of the shadow toolsuite,
    but not by all user and password management tools.