aws iam add-user-to-group
aws iam add-user-to-group --user-name beatlejuice --groupname testgroup
<aws> - every cli command starts with aws
<iam> - followed by the service which in this case is iam
<add-user-to-group> - followed by the command *notice there is 1 dash (-) with no space between add and user and to and group
<--username> - followed by --username *notice that there are 2 dashes (--) before username
<beatlejuice> - the name of your user which in this case is "beatlejuice"
<group-name> - followed by --group-name*notice that there are 2 dashes (--) before group-name and 1 dash (-) between group
and name
<testgroup> - the name we called our group