I build a script to read from diagnostic file and track a message. in case the message found a service in a server will restarted. I was successful in this however once the script reach end of the file it start again and this mean that it will keep restarting the service. I searched and found that there is library which called file::tail library which is made for this kind of issues unfortunately i was not able to modify my script in able to use this library. I am new in perl and I am trying to find my way into perl world. please help me :) 

use File::Tail;

my $diagfile;
my $Checkoutput;
my $hostName1;
my $hostName2;

sub init {
    my ($dir) = @_;
    my $line;
    my $var;
    my $val;
    open (LREP2, "$dir/config/param.ini");
    while ($line = <LREP2>) {
           chop $line;
           ($var,$val) = split(/=/, $line);
           
           if ($var eq "DIAGFILE") {
               $diagfile = $val;
           }
           if ($var eq "CHECKFILE") {
               $Checkoutput = $val;
           }
           if ($var eq "HOSTNAME1") {
               $hostName1 = $val;
           }
           if ($var eq "HOSTNAME2") {
               $hostName2 = $val;
           }
    }
    close LREP2;
}

#MAIN

die "Usage: $0 <app_root_dir>" unless @ARGV == 1;

my $app_root_dir = shift;
&init($app_root_dir);
my $line;
open (DIAG, "$diagfile");
my $clock = 0;
while (1) {
    open LOGFILE, ">>$app_root_dir/logs/detailedlog.log";
    while ($line = <DIAG>) {

        if ($line =~ /is higher than 5 seconds/) {
            if ($clock == 0) {
                $clock = 60;
                my $commandStr2 = "sc \\\\$hostName1 stop AudioSrv >$a
+pp_root_dir\\logs\\StopServiceOutput1.txt" ;
                print LOGFILE "about to execute=$commandStr2\n";
                system($commandStr2);
                print LOGFILE "just executed=$commandStr2\n";
                my $commandStr4 = "sc \\\\$hostName2 stop AudioSrv >$a
+pp_root_dir\\logs\\StopServiceOutput2.txt" ;
                print LOGFILE "about to execute=$commandStr4\n";
                system($commandStr4);
                print LOGFILE "just executed=$commandStr4\n";
                sleep(5);
                my $commandStr3 = "sc \\\\$hostName1 start AudioSrv >$
+app_root_dir\\logs\\StartServiceOutput1.txt";
                print LOGFILE "about to execute=$commandStr3\n";
                system($commandStr3);
                print LOGFILE "just executed=$commandStr3\n";
                my $commandStr5 = "sc \\\\$hostName2 start AudioSrv >$
+app_root_dir\\logs\\StartServiceOutput2.txt";
                print LOGFILE "about to execute=$commandStr5\n";
                system($commandStr5);
                print LOGFILE "just executed=$commandStr5\n";
            }
            $clock --;
            sleep(1);
        }    
        close LOGFILE;        
    }
    sleep(65);
}

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In reply to trying to implement file tail with regular expression by mkhayat

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