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To create group
#groupadd <username>
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Group level
Group level : option : no of group
Primary Group : -g : single group
Secondary Group : -G : multiple group
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To add new user in existing group
#adduser -g <primary grup> -G <secondary group> <username>
EX.
#adduser -g root -G claps raj
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To check user's Group
#groups <username>
EX.
#groups text
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To add existing user in existing group
#usermod -g <primary group> -G <secondary group> <usermane>
EX.
#usermod -g root -G claps raj
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To delete group
#groupdel <groupname>
EX.
#groupdel claps