the file /etc/group will contain the group information

groupadd assigns the group ID automatically which is graeater than id of other groups.we can create id s using the -g or -gid

the groupid must be unique and non negative .-o option allows to create duplicate or non unique ids.

by using -r or --system we can create system group the group id are between 100 to 999

--f or -- force option forces groupadd command to exit status if the group already exists

-p or --password allows groupadd command to specfy the encrypted password to the group

- k option is used to specify the group id between the given specified limits