Use of /etc/passwd-, /etc/shadow-, /etc/group- [closed]?

These are backups of previous versions. Manual pages show these files and states: /etc/passwd- Backup file for /etc/passwd. /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. See manpages.ubuntu.com/manpages/oneiric/man... and manpages.ubuntu.com/manpages/oneiric/man....

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