G'day dwslovedh,

I found your problem description very hard to follow. Do you want something like this? 

#!/usr/bin/env perl

use strict;
use warnings;

my $closest;

while (<DATA>) {
    print;

    if (/^MSG_ID_CELL_INFO_PRINT/) {
        $closest = $_;
    }

    if (/^MSG_ID_CELL_CAMP_REQ/) {
        print "\tClosest: $closest";
    }
}

__DATA__
MSG_ID_CELL_INFO_PRINT sn=1 cellid=2; 
MSG_ID_CAMP_RSP sn=2 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=3 cellid=5;
MSG_ID_CELL_INFO_PRINT sn=5 cellid=2;
MSG_ID_CAMP_RSP sn=6 cellid=4; 
MSG_ID_CAMP_RSP sn=8 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=10 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=11 cellid=5; 
MSG_ID_CAMP_RSP sn=12 cellid=2; 
MSG_ID_CAMP_RSP sn=14 cellid=3; 
MSG_ID_CELL_CAMP_REQ sn=15 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=16 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=17 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=18 cellid=2; 
MSG_ID_CAMP_RSP sn=19 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=20 cellid=5; 
MSG_ID_CELL_INFO_PRINT sn=21 cellid=2;
MSG_ID_CAMP_RSP sn=22 cellid=4; 
MSG_ID_CAMP_RSP sn=23 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;  
MSG_ID_CELL_CAMP_REQ sn=25 cellid=2;

[download]

Output:

$ pm_msg_block_extract.pl
MSG_ID_CELL_INFO_PRINT sn=1 cellid=2; 
MSG_ID_CAMP_RSP sn=2 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=3 cellid=5;
MSG_ID_CELL_INFO_PRINT sn=5 cellid=2;
MSG_ID_CAMP_RSP sn=6 cellid=4; 
MSG_ID_CAMP_RSP sn=8 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=10 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=11 cellid=5; 
MSG_ID_CAMP_RSP sn=12 cellid=2; 
MSG_ID_CAMP_RSP sn=14 cellid=3; 
MSG_ID_CELL_CAMP_REQ sn=15 cellid=2; 
    Closest: MSG_ID_CELL_INFO_PRINT sn=11 cellid=5; 
MSG_ID_CELL_INFO_PRINT sn=16 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=17 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=18 cellid=2; 
MSG_ID_CAMP_RSP sn=19 cellid=2; 
MSG_ID_CELL_INFO_PRINT sn=20 cellid=5; 
MSG_ID_CELL_INFO_PRINT sn=21 cellid=2;
MSG_ID_CAMP_RSP sn=22 cellid=4; 
MSG_ID_CAMP_RSP sn=23 cellid=2;  
MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;  
MSG_ID_CELL_CAMP_REQ sn=25 cellid=2; 
    Closest: MSG_ID_CELL_INFO_PRINT sn=24 cellid=2;

[download]

-- Ken

In reply to Re: Extract all occurrence of one msg and compare the value of the msg which is closest to the end msg by kcott
in thread Extract all occurrence of one msg and compare the value of the msg which is closest to the end msg by dwslovedh

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