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Shell Programming and Scripting
Swapping or switching 2 lines using sed
Post 302260160 by null7 on Wednesday 19th of November 2008 11:17:01 PM
11-20-2008
Quote:
Code:
awk 'NR==2 && $4 == "1021436587" {
s=$0;getline;print $0; print s;next
}
{print}' file > outfile
awk 'NR==2 && $4 == "1021436587" {
s=$0;getline;print $0; print s;next
}
{print}' file > outfile
Quote:
Code:
perl -i~ -0777pe'
s/\A(.*?\n)
((?:\S+\s+){3}1012345678\b.*?\n)
(.*?\n)
/$1$3$2/xs
' file1 file2 ... filen
perl -i~ -0777pe'
s/\A(.*?\n)
((?:\S+\s+){3}1012345678\b.*?\n)
(.*?\n)
/$1$3$2/xs
' file1 file2 ... filen
TQ.
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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)