# Ubuntu – What’s the difference between the “group” and “group-” file

etc

I know what the /etc/group file is for, but I'm also seeing a /etc/group- file. What's the difference between the two?

The same group names and ids appear in both files. Only the last column (users) is different.

I'm running ubuntu 11.04

• Though I cannot find any information in manual pages, I suppose it is a backup copy, as it is documented for /etc/shadow- in shadow manual page:
/etc/shadow-