NAME

       dnsfilter -  resolves IP addresses to host names

SYNOPSIS

       dnsfilter [ opts ]


DESCRIPTION

       dnsfilter reads a series of lines from stdin, converts an IP address to
       a host name at the beginning of each line, and prints the results to
       stdout.

       If a line does not begin with an IP address, dnsfilter leaves the line
       alone.  If an IP address does not have a host name listed in DNS,
       dnsfilter leaves the line alone.  If an IP address has a host name
       listed in DNS, dnsfilter inserts an equals sign and the host name
       before the first space or tab in the line.  If a DNS lookup fails
       temporarily, dnsfilter inserts a colon and a dash-separated error
       message before the first space or tab in the line.

       While dnsfilter is looking up an address in DNS, it reads ahead in the
       input and looks for more addresses to look up in parallel.


OPTIONS

       opts is a series of getopt-style options:


       -c n   Do at most n DNS queries in parallel.  Default: 10.


       -l n   Read ahead at most n lines.  Default: 1000.


SEE ALSO

       dnsip(1), dnsipq(1), dnsname(1), dnsmx(1), dnstxt(1), dnsqr(1),
       dnsq(1), dnstrace(1)


REFEENCE

       http://cr.yp.to/djbdns.html




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