So that makes your problem really easy (untested code): 
$isok = 1;
for $logname("logfile1", "logfile2", "logfile3")
{
  open FH, $logname ...;
  @isthisfileok=(0)x 6;
  while(<FH>)
  {
    $isthisfileok[$1]++ if /^snapshot([1-6])/;
    # last if /^snapshot([7-9]|\d{2,})/; # are snapshots sorted numeri
+cally? then you don't have to search whole file if found snapshot7 or
+ other
  }
  close FH;
  $somesnapshotnotfound = grep $_ == 0, @isthisfileok;
  $isok = 0 if !$somesnapshotnotfound;
  last if !$isok; # don't scan another file if already not ok
}
print "everything ok" if $isok;

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In reply to Re^5: How to compare 3 lists by grizzley
in thread How to compare 3 lists by shammow

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