HTABLE(8) System Manager's Manual HTABLE(8)
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 Inter‐
net RFC 810 to the format used by the network library routines. Three
files are created as a result of running htable: hosts, networks, and
gateways. The hosts file may be used by the gethostbyname(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 map‐
ping 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 gateways 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 net‐
work 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 connected is specified with the -c flag. The net‐
works, separated by commas, may be given by name or in Internet-stan‐
dard dot notation, e.g. -c arpanet,128.32,local-ether-net. Htable
only includes gateways which are directly connected to one of the net‐
works specified, or which can be reached from another gateway on a con‐
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 informa‐
tion 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 input file.
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)