┌─[16:22:45]─[kazwolfe@firewolf]
└──> ~ $ sudo hdparm -t /dev/nvme0n1

/dev/nvme0n1:
 Timing buffered disk reads: 4416 MB in  3.00 seconds = 1471.87 MB/sec

┌─[16:26:46]─[kazwolfe@firewolf]
└──> ~ $ sudo hdparm -Tt /dev/nvme0n1

/dev/nvme0n1:
 Timing cached reads:   22704 MB in  2.00 seconds = 11365.08 MB/sec
 Timing buffered disk reads: 4394 MB in  3.00 seconds = 1464.23 MB/sec

find -name "*.jpg" | sed -n 's|^.||; s|[^/]*.jpg||; :a h
s|.*/\(.*\)|\1|p
x
s|\(.*\)/.*|\1|
h
ta
s|$|\n|p' | tr '\n' ',' | sed 's/,,,/\n/g' | sed 's/^,//'

$ perl -le 'print join(",", grep{$_ % 2==0 } 0 .. 32)'
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32
$
$ perl -le '@even = grep {$_ % 2==0 } (0 .. 32); print join ",", @even'
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32
$ perl -le 'for $num (0 .. 32 ){
>               if($num % 2 == 0){
>                       push @even, $num
>               }
>            }
>            $out =  join ",", @even;
>            print $out'
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32