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Home: Perl Programming Help: Beginner:
How to isolate data elements with a data block with (\n) newlines????

preston3271
Novice

Nov 26, 2012, 2:02 PM

Post #1 of 7 (1357 views)

How to isolate data elements with a data block with (\n) newlines????	Can't Post

Hello, Perl Guru's

After several days of efforts to figure out how to gather the needed information from this block of data, I realized that I need help.

The data is as follows:

Code

__DATA__ 
RequestID:    44529658-5293-7561-0514-ef2b44ac8545 
Context: 
CN:           82d246f6-51ff-7561-1702-ae217f13e8af 
Nodename:     lnmtcodcld20 
IPAddress:    10.109.240.184 
Platform:     Solaris 5.10, CPU: Sparc 
InstallType:  Auto 
TimeReceived: 10/26/12 14:42:05 MDT 
 
RequestID:    5bacd03e-5293-7561-04ff-ba57719eb9f2 
Context: 
CN:           82c0a1c6-51ff-7561-1a7f-cb57fc0b994f 
Nodename:     lnmtcodcld10 
IPAddress:    10.109.240.181 
Platform:     Solaris 5.10, CPU: Sparc 
InstallType:  Auto 
TimeReceived: 10/26/12 14:42:06 MDT 
 
RequestID:    6dc42aaa-48b7-7561-0a8b-8e0c3919ec2c 
Context: 
CN:           e860e9c2-48af-7561-18e5-a5791ab456c6 
Nodename:     lnmtcodzcba03.scc911.com 
IPAddress:    10.100.113.32 
Platform:     Linux 2.6.32, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/25/12 08:35:27 MDT 
 
RequestID:    c4193482-6a49-7561-150b-8b0507771399 
Context: 
CN:           df58e362-6a41-7561-11aa-9f8c4f608300 
Nodename:     LMV08-DC02.corp.intrado.pri 
IPAddress:    10.100.28.1 
Platform:     Windows 6.1, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/29/12 15:07:33 MDT 
 
RequestID:    e0e00eb2-48be-7561-013b-e012ec75886d 
Context: 
CN:           2e122fe0-48be-7561-053a-a2b50066dba0 
Nodename:     lnmtcodzcba04.scc911.com 
IPAddress:    10.100.113.33 
Platform:     Linux 2.6.32, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/25/12 08:40:47 MDT

root@somesystem>/root #

What I need is to isolate the RequestID and the Nodename if the node in found within this set of data. I have tried splitting on the blank lines and then removing the the (\n) newlines and replacing them ":" using a join and then putting them into an array with no success of what I want to isolate.

I even trying to one step my results by created reference via a pattern match as follows:

Code

#!C:\strawberry\perl\bin\perl 
while (<DATA>) { 
   if(m# 
        ^\s*$ 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        (\d):\s+(\d)\n 
        ^\s*$ 
        #) 
   { 
 
    print "$1 \n"; 
   } 
     
} 
 
__DATA__ 
 
RequestID:    44529658-5293-7561-0514-ef2b44ac8545 
Context: 
CN:           82d246f6-51ff-7561-1702-ae217f13e8af 
Nodename:     lnmtcodcld20 
IPAddress:    10.109.240.184 
Platform:     Solaris 5.10, CPU: Sparc 
InstallType:  Auto 
TimeReceived: 10/26/12 14:42:05 MDT 
 
RequestID:    5bacd03e-5293-7561-04ff-ba57719eb9f2 
Context: 
CN:           82c0a1c6-51ff-7561-1a7f-cb57fc0b994f 
Nodename:     lnmtcodcld10 
IPAddress:    10.109.240.181 
Platform:     Solaris 5.10, CPU: Sparc 
InstallType:  Auto 
TimeReceived: 10/26/12 14:42:06 MDT 
 
RequestID:    6dc42aaa-48b7-7561-0a8b-8e0c3919ec2c 
Context: 
CN:           e860e9c2-48af-7561-18e5-a5791ab456c6 
Nodename:     lnmtcodzcba03.scc911.com 
IPAddress:    10.100.113.32 
Platform:     Linux 2.6.32, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/25/12 08:35:27 MDT 
 
RequestID:    aed765f4-f66b-7561-17cb-c28bb30ac813 
Context: 
CN:           48cdb95e-f655-7561-0cf2-813ab27c6c99 
Nodename:     lnmtcodcala20.scc911.com 
IPAddress:    10.109.240.125 
Platform:     Linux 2.6.18, CPU: x64 
InstallType:  Auto 
TimeReceived: 11/16/12 10:07:04 MST 
 
RequestID:    c4193482-6a49-7561-150b-8b0507771399 
Context: 
CN:           df58e362-6a41-7561-11aa-9f8c4f608300 
Nodename:     LMV08-DC02.corp.intrado.pri 
IPAddress:    10.100.28.1 
Platform:     Windows 6.1, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/29/12 15:07:33 MDT 
 
RequestID:    e0e00eb2-48be-7561-013b-e012ec75886d 
Context: 
CN:           2e122fe0-48be-7561-053a-a2b50066dba0 
Nodename:     lnmtcodzcba04.scc911.com 
IPAddress:    10.100.113.33 
Platform:     Linux 2.6.32, CPU: x64 
InstallType:  Auto 
TimeReceived: 10/25/12 08:40:47 MDT

Code

while (<DATA>) { 
chomp; 
   if(m# 
 
         \s*(\d+):\s+(\d+)(\d+):(\d+):\s+(\d+)(\d+):\s+(\d+)\s* 
        #) 
   { 
 
    print "$1 \n"; 
   } 
              print $_; 
} 
 
__DATA__ 
. . .

I even read up on using a MAP but the only example close to what I was doing was going in the opposite direction.

Please enlighten me in my efforts to isolate the RequestID and Nodename within the appropriate data block.

Preston

Laurent_R
Enthusiast / Moderator

Nov 26, 2012, 2:46 PM

Post #2 of 7 (1355 views)

Re: [preston3271] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

Perhaps something like this:

Code

my ($request, $node) 
while (<DATA>) { 
     next unless /^RequestID/ or /^Nodename/; 
     chomp; 
     my($name, $id) = split /:\s+/, $_; 
     $request = $id if $name eq "RequestID";  
     $node = $id if $name eq "Nodename"; 
     if (defined $request and defined $node) { 
          print "RequestID $request on nodename $node \n"; 
         ($request, $node) = (undef, undef); 
     } 
}

preston3271
Novice

Nov 26, 2012, 3:20 PM

Post #3 of 7 (1351 views)

Re: [Laurent_R] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

So . . .

Code

  
 
#!C:\strawberry\perl\bin\perl 
my ($request, $node); 
while (<DATA>) { 
next unless /^RequestID/ or /^Nodename/; 
chomp; 
my($name, $id) = split /:\s+/, $_; 
$request = $id if $name eq "RequestID"; 
$node = $id if $name eq "Nodename"; 
if (defined $request and defined $node) { 
print "RequestID $request on nodename $node \n"; 
($request, $node) = (undef, undef); 
  } 
}  
 
 
__DATA__  
 
RequestID:    44529658-5293-7561-0514-ef2b44ac8545 
Context: 
CN:           82d246f6-51ff-7561-1702-ae217f13e8af 
Nodename:     lnmtcodcld20  
 
RequestID:    42343436-5293-7561-0514-ef2b44ac8545 
Context: 
CN:           82d246f6-51ff-7561-1702-ae217f13e8aa 
Nodename:     lnmtcodcld10

Dang! It works! I just don't get it yet, but it works. I am still studying your perl-fu.

Perl-fu by Example
-----------------------------

line 2: Create a local anonymous array

line 3: while looping the <DATA>

line 4: Next line unless either RequestID or Nodename at start of the line

line 5: Chomp or remove "\n" newlines for each $_ entry

line 6: Create another anonymous local array and set it equal to a Perl split matching on
":" and space(s) (/:\s+/) with a >> comma which I don't understand << followed by the $_
short for return whatever from that line.

line 7: $request = $id . . . okay my Perl-fu got weak after the local array and the split. Can you enlighten me on the split, comma, and $_ please.

preston3271
Novice

Nov 26, 2012, 3:28 PM

Post #4 of 7 (1349 views)

Re: [preston3271] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

Duh! Okay, I get the /:\s+/, $_ match m/ / on the current line.

I don't get the $name and $id happening here . . .

Code

  
 
my($name, $id) = split /:\s+/, $_; 
$request = $id if $name eq "RequestID"; 
$node = $id if $name eq "Nodename";

preston3271
Novice

Nov 26, 2012, 3:39 PM

Post #5 of 7 (1348 views)

Re: [preston3271] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

Okay, my($name, $id) = split /:\s+/, $_;

line 6: match whatever before or after the ": ".

line 7: This is absolutely clever.

I am still working to mentalize the line 7 and line 8 but I get it . . . sorta.

Laurent_R
Enthusiast / Moderator

Nov 27, 2012, 12:26 AM

Post #6 of 7 (1331 views)

Re: [preston3271] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

Hi,

there is nothing really mysterious in my code suggestion. Here is the code thougoughly commented.

Code

my ($request, $node); # declare two variables 
while (<DATA>) { 
	next unless /^RequestID/ or /^Nodename/; # discard useless lines 
	chomp;  # removes trailing \n 
	my($name, $id) = split /:\s+/, $_; # splits the line on colon (:) followed by any number of spaces 
	# note that ($name, $id) is not really an anonymous array, but simply a list of two fields 
	# we have two types of line, so $name may contain RequestID or Nodename, and $id contains the corresponding value 
	# the next two lines just check what there is in the first field to decide what to do with the $id value 
	$request = $id if $name eq "RequestID"; # if the line was a RequestID line... 
	$node = $id if $name eq "Nodename"; # if it was a Nonename line 
	if (defined $request and defined $node) { # the only slightly tricky part: we print the result only if we have met both types of lines 
		print "RequestID $request on nodename $node \n";	 
		($request, $node) = (undef, undef); # reset the two variables to undef to make "defined" test possible 
	} 
}

Please don't hesitate to ask if you still don't understand something.

(This post was edited by Laurent_R on Nov 27, 2012, 4:06 AM)

preston3271
Novice

Nov 27, 2012, 9:52 AM

Post #7 of 7 (1323 views)

Re: [Laurent_R] How to isolate data elements with a data block with (\n) newlines???? [In reply to]	Can't Post

Thanks, I found my issue with my last question. I was using the "==" instead of the "eq" for grab out the desired elements I wanted. Thank you very much.

#!C:\strawberry\perl\bin\perl

@final=();
my ($request, $node);
while (<DATA>) {
next unless /^RequestID/ or /^Nodename/;
chomp;
my($name, $id) = split /:\s+/, $_;
$request = $id if $name eq "RequestID";
$node = $id if $name eq "Nodename";

if(lnmtcodcld20 eq $node)
{
print "Yes: $node \n";
push(@final, $node, $request);
} else { print "No Match: $node \n"; }

if (defined $request and defined $node) {
print "RequestID $request on Nodename $node \n";

($request, $node) = (undef, undef);
}
}

print "@final[0] and @final[1] \n";

__DATA__

RequestID: 44529658-5293-7561-0514-ef2b44ac8545
Context:
CN: 82d246f6-51ff-7561-1702-ae217f13e8af
Nodename: lnmtcodcld20
IPAddress: 10.109.240.184
Platform: Solaris 5.10, CPU: Sparc
InstallType: Auto
TimeReceived: 10/26/12 14:42:05 MDT

RequestID: 5bacd03e-5293-7561-04ff-ba57719eb9f2
Context:
CN: 82c0a1c6-51ff-7561-1a7f-cb57fc0b994f
Nodename: lnmtcodcld10
IPAddress: 10.109.240.181
Platform: Solaris 5.10, CPU: Sparc
InstallType: Auto
TimeReceived: 10/26/12 14:42:06 MDT

RequestID: 6dc42aaa-48b7-7561-0a8b-8e0c3919ec2c
Context:
CN: e860e9c2-48af-7561-18e5-a5791ab456c6
Nodename: lnmtcodzcba03.scc911.com
IPAddress: 10.100.113.32
Platform: Linux 2.6.32, CPU: x64
InstallType: Auto
TimeReceived: 10/25/12 08:35:27 MDT

RequestID: aed765f4-f66b-7561-17cb-c28bb30ac813
Context:
CN: 48cdb95e-f655-7561-0cf2-813ab27c6c99
Nodename: lnmtcodcala20.scc911.com
IPAddress: 10.109.240.125
Platform: Linux 2.6.18, CPU: x64
InstallType: Auto
TimeReceived: 11/16/12 10:07:04 MST

RequestID: c4193482-6a49-7561-150b-8b0507771399
Context:
CN: df58e362-6a41-7561-11aa-9f8c4f608300
Nodename: LMV08-DC02.corp.intrado.pri
IPAddress: 10.100.28.1
Platform: Windows 6.1, CPU: x64
InstallType: Auto
TimeReceived: 10/29/12 15:07:33 MDT

RequestID: e0e00eb2-48be-7561-013b-e012ec75886d
Context:
CN: 2e122fe0-48be-7561-053a-a2b50066dba0
Nodename: lnmtcodzcba04.scc911.com
IPAddress: 10.100.113.33
Platform: Linux 2.6.32, CPU: x64
InstallType: Auto
TimeReceived: 10/25/12 08:40:47 MDT

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