htable - convert NIC standard format host tables
/etc/htable [ -c connected-nets ] [ -l local-nets ] file
Htable is used to convert host files in the format specified in Internet RFC 810 to the
format used by the network library routines. Three files are created as a result of run-
ning htable: hosts, networks, and gateways. The hosts file may be used by the gethostby-
name(3N) routines in mapping host names to addresses if the nameserver, named(8), is not
used. The networks file is used by the getnetent(3N) routines in mapping network names to
numbers. The gateways file may be used by the routing daemon in identifying ``passive''
Internet gateways; see routed(8C) for an explanation.
If any of the files localhosts, localnetworks, or localgateways are present in the current
directory, the file's contents is prepended to the output file. Of these, only the gate-
ways file is interpreted. This allows sites to maintain local aliases and entries which
are not normally present in the master database. Only one gateway to each network will be
placed in the gateways file; a gateway listed in the localgateways file will override any
in the input file.
If the gateways file is to be used, a list of networks to which the host is directly con-
nected is specified with the -c flag. The networks, separated by commas, may be given by
name or in Internet-standard dot notation, e.g. -c arpanet,128.32,local-ether-net.
Htable only includes gateways which are directly connected to one of the networks speci-
fied, or which can be reached from another gateway on a connected net.
If the -l option is given with a list of networks (in the same format as for -c), these
networks will be treated as ``local,'' and information about hosts on local networks is
taken only from the localhosts file. Entries for local hosts from the main database will
be omitted. This allows the localhosts file to completely override any entries in the
Htable is best used in conjunction with the gettable(8C) program which retrieves the NIC
database from a host.
intro(3N), gettable(8C), named(8)
If the name-domain system provided network name mapping well as host name mapping, htable
would no longer be needed.
4.2 Berkeley Distribution May 22, 1986 HTABLE(8)