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NETGROUP_MKDB(8) System Manager's Manual NETGROUP_MKDB(8)

netgroup_mkdb
generate the netgroup databases

netgroup_mkdb [
-o database
] [
file
]

netgroup_mkdb creates Berkeley databases for the specified file. If no file is specified, /etc/netgroup is used. These databases are then installed into /etc/netgroup.db. The file must be in the correct format (see netgroup(5)).
The options are as follows:
 
 
database
Put the output databases in the named file.
The databases are used by the C library netgroup routines (see getnetgrent(3)).

/etc/netgroup.db
current netgroup database
/etc/netgroup.db.tmp
a temporary file
/etc/netgroup
current netgroup file

The netgroup_mkdb utility exits 0 on success, and >0 if an error occurs.

dbopen(3), getnetgrent(3), netgroup(5)

Because netgroup_mkdb guarantees not to install a partial destination file it must build a temporary file in the same file system and if successful use rename(2) to install over the destination file.
If netgroup_mkdb fails it will leave the previous version of the destination file intact.
June 7, 2018 OpenBSD-current