comment on

#!/usr/bin/perl -l
#
# This is an answer, in comments and code, to the question:
# How to print data between tags from file sequentially?
# URL: https://perlmonks.org/index.pl?node_id=1217156
#
=cut

NOTE: THIS IS NOT MODERN PERL BEST PRACTICES! THIS IS THE
SWISS ARMY CHAINSAW GETTING IT DONE THE OLD FASHIONED WAY:

Perlmonks are technically correct about the best way to do it 
with modules but since OP can't install modules then perl's 
built in bag of tricks can save the day. This sort of thing 
is very well known to be a bad solution to a worse problem 
but sometimes you have to do what works instead of what is best. 
This is why perl can work miracles and also why people complain 
about unmaintainable code. To be good code this entire script 
would have to be rewritten using appropriate CPAN modules.
Techniques and comments are geared entirely towards 
comprehension by the OP, still learning basics.

=cut
#
# LET'S EMBED THE FILE IN THE SCRIPT TO MAKE THIS EASY!
# YOUR FILE IS NOW ANYTHING AFTER __DATA__ AT THE END:
#
# open file
# open(FILE, "data.txt") or die("Unable to open file");
#
# OPENING FILES THE RIGHT WAY:
# use autodie; # SO YOU DON'T HAVE TO CHECK
#
# OPEN LIKE THIS TO READ FILE:
# open my $FILE, "<", "data.txt";
#
# THEN YOU CAN DO:
# my @data = <$FILE>;
#
# close $FILE;
# 
# ALWAYS START WITH THESE TWO LINES, FOR HELPFUL ERROR MESSAGES:

use strict;
use warnings;

# THIS MAKES ERROR MESSAGES EVEN BETTER BUT
# SHOULD BE REMOVED WHEN DONE HACKING:
use diagnostics;

# THIS MODULE LETS YOU SEE DATA:
use Data::Dumper;

# read file into an array

# PUT my BEFORE ALL VARIABLES TO PREVENT TYPOS LATER ON:
chomp(my @data = <DATA>); # CHOMP REMOVES END OF LINES: \n

# LOOK AT DATA:
print 'Input data: ';
print Dumper @data;
print 'That was @data (which now contains DATA).';
print 'Let\'s remove empty lines.';
print 'Press return to continue...';
<STDIN>; # PAUSE

# GET RID OF EMPTY LINES:
# \S+ means one or more characters that are not space.
@data = grep /\S+/, @data;

# LOOK AT DATA:
print Dumper @data;
print 'Empty lines removed.';
print 'Let\'s remove extra space.';
print 'Press return to continue...';
<STDIN>;

# REMOVE LEADING SPACE FROM ALL LINES:
foreach my $line (@data)
{
$line =~ s/^\s+//;
}

# LOOK AT DATA:
print Dumper @data;
print 'Extra space removed.';
print 'Let\'s make array @data into string $data.';
print 'Press return to continue...';
<STDIN>;

# PUT THE ARRAY INTO A STRING:
my $data = join "\n", @data;

# LOOK AT DATA:
print Dumper $data;
print 'Made string $data from array @data.';
print 'Let\'s find Tuples in $data and put them in @dat2.';
print 'Press return to continue...';
<STDIN>;

# PUT ALL THE TUPLES INTO A NEW ARRAY:
my @dat2 = ($data =~ /<Tuple>(.*?)<\/Tuple>/sg);

# LOOK AT DATA:
print Dumper @dat2;
print 'Found Tuples in $data and put them in @dat2.';
print 'Let\'s split @dat2 back into lines.';
print 'Press return to continue...';
<STDIN>;

# SPLIT SELF BACK TO LINES
@dat2 = map { split /\n/ } @dat2;

# LOOK AT DATA:
print Dumper @dat2;
print 'Split @dat2. Let\'s remove empty lines.';
print 'Press return to continue...';
<STDIN>;

# GET RID OF EMPTY LINES:
@dat2 = grep /\S+/, @dat2;

# LOOK AT DATA:
print Dumper @dat2;
print 'Removed empty lines.';
print 'Let\'s remove the tags.';
print 'Press return to continue...';
<STDIN>;

foreach my $line (@dat2)
{
# REMOVE THE TAGS:
$line =~ s/<[^>]+>//g; # COOL!

# ALSO REMOVE THAT TRAILING ` FROM ANY LINE (IP):
$line =~ s/\`$//;
}

# LOOK AT DATA:
print Dumper @dat2;
print 'Removed the tags.';
print 'Let\'s use our @labels and print formatted data!.';
print 'Press return to continue...';
<STDIN>;

# SETUP A COUNTER TO KEEP TRACK OF LINES. SINCE WE KNOW 
# THERE ARE 7 FOR EACH RECORD, PRINT A SEPARATOR EVERY 
# 7 LINES. THIS IS BRITTLE: IF THE DATA CHANGES IT WILL
# BREAK BUT IF THE DATA FORMAT IS STATIC THIS WILL WORK 
# TILL THE END OF TIME, OR TILL SOMEONE ELSE BREAKS IT
# BY "UPGRADING" THE CODE THIS CODE RELIES ON. BRITTLE!

my $count = 0;

# DEFINE LABELS FOR EACH LINE OF DATA:
my @labels = (
"Computer",
"IP Address",
"Root Server",
"OS",
"Last Report Time",
"BES Agent Version",
"Support Group",
);

# GET THE NUMBER OF LABELS:
my $size = scalar @labels;

foreach my $line (@dat2)
{
chomp $line; # REMOVE LINE ENDING: \n
print "$labels[$count]: $line"; # PRINT LABEL AND DATA (THIS BREAKS EA
+SY)

if ($count == ($size - 1)) { # BECAUSE...
    $count = -1;         # COMPUTERS START COUNTING AT 0
    print "";            # PRINT BLANK LINE TO SEPARATE RECORDS
    }
$count++; # INCREMENT COUNT BY 1
}

# THE EMBEDDED FILE:

__DATA__
<?xml version="1.0" encoding="UTF-8"?>
<BESAPI xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNa
+mespaceSchemaLocation="BESAPI.xsd">
        <Query Resource="(names of it, ip addresses of it, root server
+ of it, operating systems of it, last report time of it, agent versio
+ns of it, values of results from (BES Property &quot;_IRS_ServerRespo
+nsibilityGroup&quot;) of it) of bes computers whose ( name of it as l
+owercase starts with &quot;vtjaa42vl006052&quot;)">
                <Result>
                        <Tuple>
                                <Answer type="string">ServerName</Answ
+er>
                                <Answer type="string">10.10.10.1`</Ans
+wer>
                                <Answer type="string">bfRootServer (0)
+</Answer>
                                <Answer type="string">Linux Red Hat En
+terprise Server 6.9 (2.6.32-696.23.1.el6.x86_64)</Answer>
                                <Answer type="time">Fri, 22 Jun 2018 1
+0:26:53 -0500</Answer>
                                <Answer type="string">9.2.1.48</Answer
+>
                                <Answer type="string">SupportGroup1</A
+nswer>
                        </Tuple>
                </Result>
                <Evaluation>
                        <Time>34.402ms</Time>
                        <Plurality>Plural</Plurality>
                </Evaluation>
        </Query>
</BESAPI>
<?xml version="1.0" encoding="UTF-8"?>
<BESAPI xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNa
+mespaceSchemaLocation="BESAPI.xsd">
        <Query Resource="(names of it, ip addresses of it, root server
+ of it, operating systems of it, last report time of it, agent versio
+ns of it, values of results from (BES Property &quot;_IRS_ServerRespo
+nsibilityGroup&quot;) of it) of bes computers whose ( name of it as l
+owercase starts with &quot;vtjaa42vl006052&quot;)">
                <Result>
                        <Tuple>
                                <Answer type="string">ServerName</Answ
+er>
                                <Answer type="string">10.10.10.1`</Ans
+wer>
                                <Answer type="string">bfRootServer (0)
+</Answer>
                                <Answer type="string">Linux Red Hat En
+terprise Server 6.9 (2.6.32-696.23.1.el6.x86_64)</Answer>
                                <Answer type="time">Fri, 22 Jun 2018 1
+0:26:53 -0500</Answer>
                                <Answer type="string">9.2.1.48</Answer
+>
                                <Answer type="string">SupportGroup1</A
+nswer>
                        </Tuple>
                </Result>
                <Evaluation>
                        <Time>34.402ms</Time>
                        <Plurality>Plural</Plurality>
                </Evaluation>
        </Query>
</BESAPI>

<?xml version="1.0" encoding="UTF-8"?>
<BESAPI xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNa
+mespaceSchemaLocation="BESAPI.xsd">
        <Query Resource="(names of it, ip addresses of it, root server
+ of it, operating systems of it, last report time of it, agent versio
+ns of it, values of results from (BES Property &quot;_IRS_ServerRespo
+nsibilityGroup&quot;) of it) of bes computers whose ( name of it as l
+owercase starts with &quot;vtjaa42vl006052&quot;)">
                <Result>
                        <Tuple>
                                <Answer type="string">ServerName</Answ
+er>
                                <Answer type="string">10.10.10.1`</Ans
+wer>
                                <Answer type="string">bfRootServer (0)
+</Answer>
                                <Answer type="string">Linux Red Hat En
+terprise Server 6.9 (2.6.32-696.23.1.el6.x86_64)</Answer>
                                <Answer type="time">Fri, 22 Jun 2018 1
+0:26:53 -0500</Answer>
                                <Answer type="string">9.2.1.48</Answer
+>
                                <Answer type="string">SupportGroup1</A
+nswer>
                        </Tuple>
                </Result>
                <Result>
                        <Tuple>
                                <Answer type="string">ServerName</Answ
+er>
                                <Answer type="string">10.10.10.1`</Ans
+wer>
                                <Answer type="string">bfRootServer (0)
+</Answer>
                                <Answer type="string">Linux Red Hat En
+terprise Server 6.9 (2.6.32-696.23.1.el6.x86_64)</Answer>
                                <Answer type="time">Fri, 22 Jun 2018 1
+0:26:53 -0500</Answer>
                                <Answer type="string">9.2.1.48</Answer
+>
                                <Answer type="string">SupportGroup1</A
+nswer>
                        </Tuple>
                </Result>
                <Evaluation>
                        <Time>34.402ms</Time>
                        <Plurality>Plural</Plurality>
                </Evaluation>
        </Query>
</BESAPI>
[download]

_{STOP REINVENTING WHEELS, START BUILDING SPACE ROCKETS!—CPAN} 🐪

In reply to Re^3: How to print data between tags from file sequentially? by usemodperl
in thread How to print data between tags from file sequentially? by TonyNY

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