02-11-2012
help with unix command
I have a file with the following content. It has an ip address with some information
111.111.111.111 hostname
hostname
222.222.222.222 hostname1
hostname1
333.333.333.333 hostname3
444.444.444.444 hostname4
hostname4
555.555.555.555 hostname5
666.666.666.666 hostname6
777.777.777.777 hostname7
hostname7
I would like to find the ips that have a blank line followed by them
for example
my output should only show
333.333.333.333 hostname3
555.555.555.555 hostname5
666.666.666.666 hostname6
So if a line is followed by a blank line I want to copy that line into a file.
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LEARN ABOUT DEBIAN
xml::quote
Quote(3pm) User Contributed Perl Documentation Quote(3pm)
NAME
XML::Quote - XML quote/dequote functions
SYNOPSIS
use strict;
use XML::Quote qw(:all);
my $str=q{666 > 444 & "apple" < 'earth'};
print xml_quote($str),"
";
# 666 > 444 & "apple" < 'earth'
my $str2=q{666 > 444 & "apple" < 'earth'};
print xml_dequote($str2),"
";
# 666 > 444 & "apple" < 'earth'
my $str3=q{666 > 444 & "apple" < 'earth'};
print xml_quote_min($str3),"
";
# 666 > 444 & "apple" < 'earth'
DESCRIPTION
This module provides functions to quote/dequote strings in "xml"-way.
All functions are written in XS and are very fast; they correctly process utf8, tied, overloaded variables and all the rest of perl
"magic".
FUNCTIONS
$quoted = xml_quote($str);
This function replaces all occurences of symbols '&', '"', ''', '>', '<' to '&', '"', ''', '>', '<' respectively.
Returns quoted string or undef if $str is undef.
$dequoted = xml_dequote($str);
This function replaces all occurences of '&', '"', ''', '>', '<' to '&', '"', ''', '>', '<' respectively. All
other entities (for example ) will not be touched.
Returns dequoted string or undef if $str is undef.
$quoted = xml_quote_min($str);
This function replaces all occurences of symbols '&', '"', '<' to '&', '"', '<' respectively. Symbols ''' and '>' are not
replaced.
Returns quoted string or undef if $str is undef.
EXPORT
xml_quote(), xml_dequote() are exported as default.
PERFORMANCE
You can use t/benchmark.pl to test the perfomance. Here is the result on my P4 box.
Benchmark: timing 1000000 iterations of perl quote, xs quote...
perl quote: 108 wallclock secs (88.08 usr + 0.01 sys = 88.09 CPU) @ 11351.64/s (n=1000000)
xs quote: 20 wallclock secs (16.78 usr + 0.00 sys = 16.78 CPU) @ 59591.20/s (n=1000000)
Benchmark: timing 1000000 iterations of perl dequote, xs dequote...
perl dequote: 106 wallclock secs (85.22 usr + 0.09 sys = 85.31 CPU) @ 11721.54/s (n=1000000)
xs dequote: 19 wallclock secs (15.92 usr + 0.02 sys = 15.94 CPU) @ 62743.13/s (n=1000000)
AUTHOR
Sergey Skvortsov <skv@protey.ru>
SEE ALSO
http://www.w3.org/TR/REC-xml <http://www.w3.org/TR/REC-xml>, perlre
COPYRIGHT
Copyright 2003 Sergey Skvortsov <skv@protey.ru>. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2008-06-26 Quote(3pm)