Hi,
'man' is your friend!
Quote:
excerpt from 'man group';
NAME
group - user group file
DESCRIPTION
/etc/group is a text file which defines the groups on the system. There is one entry per line, with
the following format:
group_name:passwd:GID:user_list
The field descriptions are:
group_name
the name of the group.
password
the (encrypted) group password. If this field is empty, no password is needed.
GID the numerical group ID.
user_list
a list of the usernames that are members of this group, separated by commas.
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If you set the 'passwd' parameter then a password will be required.