Difference between "usermod -aG" and "usermod -G" options in linux?

In summary, the conversation discusses the differences between the "usermod -aG" and "usermod -G" options on CentOS 7, with the former adding a user to a secondary group and the latter replacing all secondary groups with a new one. An example scenario is provided to demonstrate the effects of each option.
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  • #2
Code:
$ id pbuk
uid=1001(pbuk) gid=1002(pbuk) groups=1002(pbuk)
$ # Adds project-a as a secondary group
$ usermod -aG project-a pbuk
$ id pbuk
uid=1001(pbuk) gid=1002(pbuk) groups=1002(pbuk),1003(project-a)
$ # Adds project-b as a secondary group
$ usermod -aG project-b pbuk
$ id pbuk
uid=1001(pbuk) gid=1002(pbuk) groups=1002(pbuk),1003(project-a),1004(project-b)
$ # Deletes all secondary groups then adds project-c as a secondary group
$ # (this is not often what you want to do)
$ usermod -G project-c pbuk
$ id pbuk
uid=1001(pbuk) gid=1002(pbuk) groups=1002(pbuk),1005(project-c)
 
  • #3
thanks for the example.
 

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