Is it necessary to use hashes or more complicated data structures? What about simple array?

my @times;
while (<LOGFILE>){
  if (/\b$Autosys/) {
    push @times, substr($_, 0, 20);
  }
}
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Update: yes, you can downvote me, 'cause HoA is the best way here. I misunderstand post. Shame on me.