I changed the code and i am returning 0 when i am getting success. This is working fine for the snippet of the logfile i sent, but when i tested it on the logfile it does not print any data. The changed code is--

#!/usr/bin/perl

my $logFile = $ARGV[0];
die "usage: $0 <logFile>" unless $logFile;
die "Logfile $logFile doesn't exist" unless -f "$logFile";
my %no_of_questions;
my %timestamp;
open (FP,"<$logFile") or die "unable to open file $!" ;
@records=<FP>;
chomp(@records);

for($index=0;$index<@records;$index++)
    {
        if($records[$index] =~ /^(.*)INFO:.*Entering QnAModule::authen
+ticate/)
        {
            #printf "in INFO:.*Entering QnAModule::authenticate\n";
            $Time_Stamp = $1;
            die "Some error in search_for_username_and_no_of_questions
+" if (search_for_username_and_no_of_questions() == -1);
            die "Some error in end_block" if (end_block() == -1);
            #last;
        }
    }        
            
            


sub search_for_username_and_no_of_questions
{
printf "inside search_for_username_and_no_of_questions\n";
            for($index=0;$index<@records;$index++)
            {
                if ($records[$index] =~ /userName :\[(..*)\]/) 
                {
                    #printf "in user name identification \n";
                    $User_Name = $1;
                    $User_Name =~ s/\s+//g;
                    for(;$index<@records;$index++)
                    {
                        if ($records[$index] =~ /Set of questions\(bit
+map\) selected : (\d+)/) 
                        {
                            #printf "in set of questions\n";
                            $Bitmap_Number_For_Questions = $1;
                            $no_of_questions{$User_Name}=$Bitmap_Numbe
+r_For_Questions;
                            $timestamp{$User_Name}=$Time_Stamp;
                            #printf "DETAIL: LINE NO: $index\n";
                            #printf "$Time_Stamp,$User_Name,$Bitmap_Nu
+mber_For_Questions\n";
                            return 0;
                        }
                    }
                }
            }
        return -1;
}

sub end_block
{
printf "Inside end_block\n";
    for($index=0;$index<@records;$index++)
    {
        
        if($records[$index] =~ /QNA Step.*AUTH IN PROGRESS/)
        {
            printf "DETAIL: auth in progress\n";
            for(;$index<@records;$index++)
            {
                if ($records[$index] =~ /ArAuthFrameworkImpl::doPostAu
+th.*Authentication mechanism returned \[(..*)\] for AuthIdentity \[(.
+.*)\]/)
                {
                    #printf "done one request \n";
                    #printf "$records[$index]\n";
                    my $return_code = $1;
                    my $temp_user = $2;
                    $temp_user =~ s/\s+//g;
                    #printf "user = $temp_user\n";
                    if(exists($no_of_questions{$temp_user}))
                    {
                        if ($return_code == 0) 
                        {
                            printf "$temp_user,$no_of_questions{$temp_
+user} , $timestamp{$temp_user} , \"Success\" \n";
                            return 0;
                        }
                        elsif ($return_code > 1)
                        {
                            printf "$temp_user,$no_of_questions{$temp_
+user} , $timestamp{$temp_user} , \"Failure\" \n";
                            return 0;
                        }
                        for(;$index<@records;$index++)
                        {
                            if ( ($records[$index] =~ /Prepared to Sen
+d OK/) || ($records[$index] =~ /Sending Invalid credential/) )
                            {
                                #printf "end of file\n";
                            }
                        }
                    }                
                }            
            }
        }
    }
    return -1;
}
[download]

I ran this on this snippet logfile

monday 12:55:66 INFO:Entering QnAModule::authenticate
monday 12:55:66 userName :[prasanna]
monday 12:55:66 Set of questions(bitmap) selected : 13
monday 12:55:66 QNA Step.*AUTH IN PROGRESS
monday 12:55:66 ArAuthFrameworkImpl::doPostAuth.*Authentication mechan
+ism returned [4] for AuthIdentity [prasanna]
monday 12:55:66 Prepared to Send OK 
monday 12:55:66 Sending Invalid credential
[download]

and i got this result which is as expected-

inside search_for_username_and_no_of_questions
Inside end_block
DETAIL: auth in progress
prasanna,13 , monday 12:55:66  , "Failure"
[download]

but when i ran it on my actual log file i ran it like this-- C:\Perl Script>perl per_user_qna_detail.pl arcotwebfort_29May09_19_17_47.log>res ults.txt Some error in end_block at per_user_qna_detail.pl line 19, <FP> line 67209. i got this result--

inside search_for_username_and_no_of_questions
Inside end_block
DETAIL: auth in progress
[download]

why it is happening? please give me some suggestions. Thanks NT