NAME

netgroup − list of network groups

DESCRIPTION

Netgroup defines network wide groups, used for permission checking when doing remote mounts, remote logins, and remote shells.  For remote mounts, the information in netgroup is used to classify machines; for remote logins and remote shells, it is used to classify users.  Each line of the netgroup file defines a group and has the format

 groupname member1 member2 .... 

where memberi is either another group name, or a triple:

 (hostname, username, domainname)

Any of three fields can be empty, in which case it signifies a wild card.  Thus

 universal (,,)

defines a group to which everyone belongs.  Field names that begin with something other than a letter, digit or underscore (such as “-”) work in precisely the opposite fashion.  For example, consider the following entries:

 justmachines(analytica,-,sun)
 justpeople(-,babbage,sun)

The machine analytica belongs to the group justmachines in the domain sun, but no users belong to it. Similarly, the user babbage belongs to the group justpeople in the domain sun, but no machines belong to it.

Network groups are contained in the yellow pages, and are accessed through these files:

 /etc/yp/domainname/netgroup.dir
 /etc/yp/domainname/netgroup.pag
 /etc/yp/domainname/netgroup.byuser.dir
 /etc/yp/domainname/netgroup.byuser.pag
 /etc/yp/domainname/netgroup.byhost.dir
 /etc/yp/domainname/netgroup.byhost.pag

These files can be created from /etc/netgroup using makedbm(8).

FILES

/etc/netgroup
/etc/yp/domainname/netgroup.dir
/etc/yp/domainname/netgroup.pag
/etc/yp/domainname/netgroup.byuser.dir
/etc/yp/domainname/netgroup.byuser.pag
/etc/yp/domainname/netgroup.byhost.dir
/etc/yp/domainname/netgroup.byhost.pag

SEE ALSO

getnetgrent(3), exportfs(8), makedbm(8), ypserv(8)

Sun Release 3.2  —  Last change: 1 February 1985