Group ID's and Files
I am slightly confused with the use of Groups in Linux. The way I understand it, the group ID in the passwd field is used to assign an account to a particular group. The group file also has a member list. Can an account belong to more than one group?
The account john has a group id of 25 in the passwd file
The group file has several groups
Does john belong to group 25 even though his name is not in the member list field?
Does john also belong to group 26, since his account is listed in the member list field?