new to writing script files

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unbound

unbound(8)							   unbound 1.5.1							unbound(8)

NAME

       unbound - Unbound DNS validating resolver 1.5.1.

SYNOPSIS

       unbound [-h] [-d] [-v] [-c cfgfile]

DESCRIPTION

       Unbound is a caching DNS resolver.

       It uses a built in list of authoritative nameservers for the root zone (.), the so called root hints.  On receiving a DNS query it will ask
       the root nameservers for an answer and will in almost all cases receive a delegation to a top level domain (TLD) authoritative  nameserver.
       It  will  then  ask  that nameserver for an answer.  It will recursively continue until an answer is found or no answer is available (NXDO-
       MAIN).  For performance and efficiency reasons that answer is cached for a certain time (the answer's time-to-live or TTL).  A second query
       for the same name will then be answered from the cache.	Unbound can also do DNSSEC validation.

       To use a locally running Unbound for resolving put

	     nameserver 127.0.0.1

       into resolv.conf(5).

       If  authoritative  DNS  is needed as well using nsd(8), careful setup is required because authoritative nameservers and resolvers are using
       the same port number (53).

       The available options are:

       -h     Show the version and commandline option help.

       -c cfgfile
	      Set  the	config	file  with  settings  for  unbound  to	read  instead	of   reading   the   file   at	 the   default	 location,
	      /usr/local/etc/unbound/unbound.conf. The syntax is described in unbound.conf(5).

       -d     Debug  flag:  do	not fork into the background, but stay attached to the console.  This flag will also delay writing to the log file
	      until the thread-spawn time, so that most config and setup errors appear on stderr. If given twice or more, logging does not  switch
	      to the log file or to syslog, but the log messages are printed to stderr all the time.

       -v     Increase	verbosity.  If	given  multiple times, more information is logged.  This is in addition to the verbosity (if any) from the
	      config file.

SEE ALSO

       unbound.conf(5), unbound-checkconf(8), nsd(8).

AUTHORS

       Unbound developers are mentioned in the CREDITS file in the distribution.

NLnet Labs							   Dec	8, 2014 							unbound(8)

UNIX for Dummies Questions & Answers