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Solved: How do I Remove User from Staff Group in Oracle Linux/Unix Solaris?

Problem: How to remove user from staff group in Oracle Linux/Unix Solaris?

calapp@hostname:/$ sudo usermod -G oracle calapp
calapp@hostname:/$ id
uid=100(calapp) gid=10(staff)


Every user must have a default group. If you want to change the default group for user calapp to not be staff you will have to choose a different one for make calapp’s default group. Staff is the usual default for most users. If you are doing this for security reasons, you probably want to add an entirely new group just for calapp. You will need to find an unused gid.

Run this command to get a list of used group numbers:
getent group | sed -e 's/^[^:]*:://' -e 's/:.*$//' | sort -n -u

Find an unused number greater than 1000, then use that number for the gid to create a new group for calapp:
groupadd -g gid calapp

Check to see if that worked with:
getent group calapp

Then change calapp’s default group to calapp:
usermod -g calapp calapp

You can remove a user from a supplementary group on Solaris using usermod and -G:
usermod -G -groupname username

The groupname here can be a list of groups, each preceded by a “-” and separated by a comma, to remove a user from multiple group, contrary to what was suggested in a previous comment. You can add groups to the list for a user in the same way using the “+” sign.

If you want to change default / login group to oracle for user calapp, then use:
usermod -g oracle calapp

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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