Benjamin Jeeves,
    You can probably figure this out. Try running the code below supplying
whatever file name you choose to save it as for an argument.

#!/usr/bin/perl -w
use strict;
my $filein = $ARGV[0];
print "$filein\n";
open(FILEIN, $filein);
my $counter = 0;
my $counter1;
&start;
sub start {
 for(;;) {
  while ( <FILEIN> ) {
   build_db();
   $counter++;
   alert();
   $counter1++;
   print "$counter..$counter1\n\t\t$_";
   exit if $counter > 2;
  }
  sleep 2;
  seek(FILEIN,0,1);
 }
}
sub alert
{
 while( <FILEIN> )
 {
  print"Alert called\n\t$_";
 }
}
sub build_db
{
 print"build_db called\n";
}

HTH



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