RHEL 6 add group question

I am trying to add user mqm to group mqbrkrs

I do the following but I can not quite get the commanf

[root@ex5b mqm]# groups mqm
mqm : mqm
[root@ex5b mqm]# id mqm
uid=495(mqm) gid=500(mqm) groups=500(mqm)
[root@ex5b mqm]#
[root@ex5b mqm]#
[root@ex5b mqm]# usermod mqm -g mqbrkrs
usermod: user 'mqbrkrs' does not exist
[root@ex5b mqm]#
[root@ex5b mqm]#
[root@ex5b mqm]# usermod mqm -G mqbrkrs[mqm]
usermod: user 'mqbrkrs[mqm]' does not exist
[root@ex5b mqm]#
[root@ex5b mqm]# useradd mqm -g mqbrkrs
useradd: user 'mqm' already exists
[root@ex5b mqm]#

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What am I missions

BTW, what is the command to show a list of users in a group
Los Angeles1Asked:
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mohansahuCommented:

1.useradd Example - Add A New User To Secondary Group

useradd -G <Group name> <username>

useradd -G mqbrkrs mqm

2.usermod example - Add a existing user to existing group

usermod -a -G  mqbrkrs mqm


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arnoldCommented:
groupadd groupname
groupadd -g <GID> groupname
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jgiordanoCommented:
usermod -g <gid #> user
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jgiordanoCommented:
So it is capital G sorry

#usermod -G mantles mqm
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jgiordanoCommented:
Damn autocorrect

usermod -G <gid of mqbrkrs> <user to add>

Use the groupadd example from above if the group doesn't exist
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TintinCommented:
The correct syntax is

usermod -G mqbrkrs mqm

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note that the username is specified last.
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