DragonFly On-Line Manual Pages

HF(1)                  DragonFly General Commands Manual                 HF(1)

NAME
       hf, ef, nf, pf - address to name filters

SYNOPSIS
       hf [-1abcdilN] [-f format] [-t secs] [file ...]
       ef [-d] [file ...]
       nf [-di] [file ...]
       pf [-d] [file ...]

DESCRIPTION
       These filters reads the named files (or from stdin if there are none)
       and replace occurrences of a particular kind of address to the
       corresponding name:

              hf - converts raw internet addresses to hostnames.
              ef - converts ethernet addresses to hostnames.
              nf - converts network addresses to names.
              pf - converts square bracketed port numbers to names.

OPTIONS
       Options common to all programs:

       -d     Dump the hash table (usually for debugging purposes).

       Options specific to hf:

       -1     Attempt to convert only the first address on a line.

       -a     Use asynchronous dns lookups.

       -b     Prints both the hostname and the ip address (the latter in
              parentheses).  This is a shortcut for -f "%h(%i)".

       -c     Checks the names against ip addresses; that is, the hostname the
              address resolves to must resolve back to the address or else the
              address is not converted to a hostname.

       -f     Specify a format string containing escapes to be used to create
              the replacement text. The escapes are as follows:

                     %h - hostname (%D, %N, %l or even %i)
                     %D - local domain truncated hostname
                     %N - domain truncated hostname
                     %l - long hostname (FQDN)
                     %i - ip address
                     %% - %

              Unrecognized escapes expand to the character without the
              percent.  It's acceptable to use specific escapes more than
              once. Specifying an empty format resets it to the default
              ("%h").

       -i     Force converted names to be all lowercase.

       -l     By default, hf strips the domain part of hostnames in the local
              domain. The -l flag suppresses this stripping.

       -N     Strips the entire domain of all hostnames.

       -t     Specify a timeout (in seconds) for name and address lookups. By
              default, timeouts are left up to the resolver routines.

       Options specific to nf:

       -i     Force converted names to be all lowercase.

       -b     Prints both the hostname and the ip address (the latter in
              parentheses).

       -p     Pad network addresses to four octets.

SEE ALSO
       gethostbyaddr(3), ether_aton(3), getnetbyaddr(3), getservbyport(3)

BUGS
       If a port number has different tcp and udp names, pf will favor the tcp
       name.

4th Berkeley Distribution      December, 9 2009                          HF(1)