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Full Discussion: how to filter files with given format
Top Forums Shell Programming and Scripting how to filter files with given format Post 302689465 by esolvepolito on Tuesday 21st of August 2012 11:53:39 AM
Old 08-21-2012
how to filter files with given format
Hi, all, I have files like:
Code:
nameserver 216.66.22.2                           ; tserv1.ash1.ipv6.he.net. tserv13.ash1.ipv6.he.net.
nameserver 216.66.38.58                          ; tserv1.tor1.ipv6.he.net. tserv21.tor1.ipv6.he.net.
nameserver 216.218.221.6                         ; tserv1.hkg1.ipv6.he.net. tserv20.hkg1.ipv6.he.net.
nameserver 216.218.226.238                       ; tserv1.sea1.ipv6.he.net. tserv14.sea1.ipv6.he.net.
nameserver 2001:470:0:470::470                   ; ns1.fmt.he.net. - Filtered
nameserver 2001:470:0:471::471                   ; ns2.fmt.he.net. - Filtered
nameserver 2001:470:0:472::472                   ; ns1.sjc.he.net. - Filtered
nameserver 2001:470:0:473::473                   ; ns1.fmt2.he.net. - Filtered

;
; Cogent
; These servers may not be reachable as Cogent does not have peering with some ISPs and refuses to buy transit.
;
nameserver 2001:978:1:1::d                       ; eu-res1.dns.cogentco.com.
nameserver 2001:978:1:2::d                       ; eu-res2.dns.cogentco.com.
nameserver 2001:978:1:20::1a                     ; res1-fra03-v6.sys.cogentco.com.
nameserver 2001:978:1:22::1a                     ; res1-mad05-v6.sys.cogentco.com.
nameserver 2001:550:1:1::d                       ; na-res1.dns.cogentco.com.
nameserver 2001:550:1:2::d                       ; na-res2.dns.cogentco.com.
nameserver 2001:550:1:2:203:baff:fe2c:c022       ; <unknown>
nameserver 2001:550:1:20::1a                     ; res1-herndon-v6.sys.cogentco.com.
nameserver 2001:550:1:21::2a                     ; res2-herndon-v6.sys.cogentco.com.
nameserver 2001:550:1:22::1a                     ; res1-nyc-v6.sys.cogentco.com.
nameserver 2001:550:1:23::2a                     ; res2-nyc-v6.sys.cogentco.com.
nameserver 2001:550:1:24::1a                     ; res1-chi-v6.sys.cogentco.com.
nameserver 2001:550:1:25::2a                     ; res2-chi-v6.sys.cogentco.com.
nameserver 2001:550:1:26::1a                     ; res1-la-v6.sys.cogentco.com.
nameserver 2001:550:1:27::2a                     ; res2-la-v6.sys.cogentco.com.
nameserver 2001:550:1:27:203:baff:fe2c:c022      ; <unknown>

I want to extract the ipv4 addresses(the format is x.y.z.k) and put them into a new list

how to achieve this? thanks
 

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LEARN ABOUT DEBIAN

nisd_resolv

rpc.nisd_resolv(1M)					  System Administration Commands				       rpc.nisd_resolv(1M)

NAME

       rpc.nisd_resolv, nisd_resolv - NIS+ service daemon

SYNOPSIS

       rpc.nisd_resolv [-v | -V]  [ -F [-C fd]] [-t xx] [-p yy]

DESCRIPTION

       rpc.nisd_resolv	is  an auxiliary process which provides DNS forwarding service for NIS hosts requests to both ypserv and rpc.nisd that are
       running in the NIS compatibility mode. It is generally started by invoking  rpc.nisd(1M) with the -B  option  or  ypserv(1M)  with  the	-d
       option. Although it is not recommended, rpc.nisd_resolv can also be started independently with the following options.

       This  command requires that the /etc/resolv.conf file be setup for communication with a DNS nameserver. The nslookup utility can be used to
       verify communication with a DNS nameserver.  See resolv.conf(4) and nslookup(1M).

OPTIONS

       -F	Run in foreground.

       -C fd	Use  fd for service xprt (from nisd).

       -v	Verbose. Send output to the syslog daemon.

       -V	Verbose. Send output to stdout.

       -t xx	Use transport  xx.

       -p yy	Use transient program#	yy.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnisu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nslookup(1M), rpc.nisd(1M), resolv.conf(4), attributes(5)

NOTES

       NIS+ might not be supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from  NIS+  to  LDAP  are
       available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html.

SunOS 5.10							    12 Dec 2001 					       rpc.nisd_resolv(1M)
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