To limit multiple Shell login by the same user on a Linux box you have to set a maximum number of logins in /etc/security/limits.conf for a user or a group.
For example:
# groupadd salesgroup
# useradd -G salesgroup salesman1
# useradd -G salesgroup salesmanager
# echo "@salesgroup - maxlogins 10" >> /etc/security/limits.conf
# echo "salesman1 - maxlogins 5" >> /etc/security/limits.conf
Here the group salesgroup can make a maximum of 10 logins at a time.
And the user salesman1 is limited to 5 simultaneous logins.
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