[英]Perl reading a file and storing each line as variable/value
I'm pretty new to perl, but so far got to do pretty much everything I needed to, until now. 我对perl还是很陌生,但是到目前为止,到目前为止,我几乎已经要做我需要做的所有事情。
I have a file formatted like so: 我有一个格式如下的文件:
#IPAAS
@NX_iPaaS_AuthKey=dGstaG9zaGlub0BqcCasdpasdHN1LmNvbTppUGFhUzAw
@NX_iPaaS_href=live/661134565/process/75231
I'd like to read each line that begins with @NX_iPaaS into a similar named variable, eg @NX_iPaaS_AuthKey would create a new variable called $NX_IPAAS_AUTHKEY and hold the value, NX_iPaaS_href would result in a new variable called $NX_IPAAS_HREF with a value and so on? 我想将以@NX_iPaaS开头的每一行读入一个类似的命名变量,例如@NX_iPaaS_AuthKey将创建一个名为$ NX_IPAAS_AUTHKEY的新变量并保存该值,NX_iPaaS_href将导致一个名为$ NX_IPAAS_HREF的新变量,并带有一个值,因此上?
--Update-- -更新-
Hey guys, I need a slight tweak required to the above solution... 大家好,我需要对上述解决方案进行一些微调。
So I've just discovered that the file I'm reading in will have 'sections', eg 所以我刚刚发现,我正在阅读的文件将具有“部分”,例如
----- SECTION=cr
NX_NTF_PERSISTENT_ID=cr:400017
NX_NTF_REF_NUM=45
----- SECTION=cnt
NX_NTF_PERSISTENT_ID=cnt:F9F342055699954C93DE36923835A182
You can see that one of the variables appears in both sections, which (because I don't have 'next unless defined') results in the previous value being overwritten. 您可以看到两个部分都出现了一个变量,这是因为我没有“除非定义,否则”,这将导致先前的值被覆盖。 Is there a way to prefix the NX_NTF_ variable names with the value provided on the 'section=' line at the top of each section? 是否可以使用每个部分顶部的“ section =”行中提供的值为NX_NTF_变量名添加前缀?
Thanks 谢谢
The good practice is to use hashes. 优良作法是使用散列。
my %hash;
while (<>) {
chomp;
my ($key, $value) = split /=/;
next unless defined $value;
$hash{$key} = $value;
}
See Why it's stupid to "use a variable as a variable name" on why it is not a good idea to use variable variable names. 请参阅为什么“使用变量作为变量名”是愚蠢的,以了解为什么使用变量变量名不是一个好主意。
What you want to use is a hash. 您要使用的是哈希。 Something like: 就像是:
use strict;
use warnings;
my $input = "yourfilename.txt";
open(my $IN, "<", $input) or die "$0: Can't open input file $input: $!\n";
my %NX_iPaaS_vars;
while (<$IN>) {
chomp;
if ($_ =~ /^\@NX_iPaaS/) {
my ($key, $value) = split(/=/, $_);
$NX_iPaaS_vars{$key} = $value;
}
}
To use a variable later on, use $NX_iPaaS_vars{"name of variable you want"}
, for example: 要稍后使用变量,请使用$NX_iPaaS_vars{"name of variable you want"}
,例如:
my $href_path = $NX_iPaaS_vars{'@NX_iPaaS_href'};
# Do something with $href_path here...
#!/usr/bin/perl -w
use strict;
open(FILE,"test.txt");
my %hash;
foreach (<FILE>)
{
if($_=~/@(\S+)=(\S+)/)
{
$hash{$1}=$2;
}
}
close(FILE);
# Test Code
foreach (keys %hash)
{
printf("%s=%s\n",$_,$hash{$_});
}
This solution works well if variable names are unique. 如果变量名称是唯一的,则此解决方案效果很好。
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