One Day One GNU/Linux Command :-
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groupadd -- Create a new group
Summary :
The groupadd command creates a new group account using the values
specified on the command line and the default values from the system.
Example:
# groupadd newgrp -- Create a new group
# groupadd -g 600 newgrp -- Create newgrp with specified Group ID.
# groupadd -f newgrp -- Force flag. Don't show error message.
Read: man groupadd
HTH :)
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Bharathi S