Question

我使用grep在temporaryF文件和arrayWarning之间返回不匹配的数组

my @c =grep!${{map{$_,1}@temporaryF}{$_},@arrayWarning;

在@c内部有很多行，例如：

Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:06:55 fibre channel ROOT cause
Sun Sep 30 00:08:55 fibre channel ROOT cause 
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:20:55 fibre channel DANN 
Sun Sep 30 00:30:55 fibre channel DANN

你可以看到ROOT在@c中发生了3次。如何迭代@c以仅输出最新出现的ROOT - ＆gt; Sun Sep 30 00:10:55光纤通道ROOT 而不是其他重复的行。

所以它会变成：

Sun Sep 30 00:05:55 fibre channel DENY forever  
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:30:55 fibre channel DANN

Answer 1

使用ROOT / DENY / DANN作为键的哈希：

my %latest = map { (split(" "))[6] => $_ } @c;

假设@c按日期排序，values %latest将包含：

Sun Sep 30 00:10:55 fibre channel ROOT cause
Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:30:55 fibre channel DANN

Answer 2

注意：这是@RobEarl答案的延伸 - 所以如果您喜欢，请务必给予他积分！

这里的重点是存储行数，以确保可以订购输出。

长版

#!/usr/bin/perl

use strict;
use warnings;

# store (with count)
my $count  = 0;
my %latest = map {
    my $source = (split /\s+/ => $_)[6];
    $source => {count => $count++, string => $_};
} <DATA>;

# output
print $_->{string} for sort {$a->{count} <=> $b->{count}} values %latest;

__DATA__
Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:06:55 fibre channel ROOT cause
Sun Sep 30 00:08:55 fibre channel ROOT cause 
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:20:55 fibre channel DANN 
Sun Sep 30 00:30:55 fibre channel DANN

<强>输出：

Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:30:55 fibre channel DANN

感觉有点像Schwartzian transform。

单线版

这是一个很好的例子，可以通过一个简单的oneliner和perl强大的interpreter switches完成一个任务：

$ perl -nale '$l{$F[6]}={c=>$c++,s=>$_};END{print$_->{s}for sort{$a->{c}<=>$b->{c}}values%l}'
Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:06:55 fibre channel ROOT cause
Sun Sep 30 00:08:55 fibre channel ROOT cause 
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:20:55 fibre channel DANN 
Sun Sep 30 00:30:55 fibre channel DANN

输出：

Sun Sep 30 00:05:55 fibre channel DENY forever
Sun Sep 30 00:10:55 fibre channel ROOT cause  
Sun Sep 30 00:30:55 fibre channel DANN

Perl - 将数组元素句子与变量进行比较

2 个答案:

长版

单线版