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my $allcool = 0; # start false
foreach my $psaxline (@psax_list) {
  $allcool++ if ($psaxline =~ /$process/);
...
unless ($allcool) {
  print "$process does not appear to be running!\n";
}

print "$process does not appear to be running!\n"
  unless grep /$process/, @psax_list;