ken@titan ~/tmp
$ rm pm_11148149_storable_first_run.sto

ken@titan ~/tmp
$ ls -l pm_11148149_storable_first_run.sto
ls: cannot access 'pm_11148149_storable_first_run.sto': No such file or directory

ken@titan ~/tmp
$ ./pm_11148149_storable_first_run_1.pl
Perl version: v5.30.0
Serialised data:
{}

ken@titan ~/tmp
$ ls -l pm_11148149_storable_first_run.sto
-rw-r--r-- 1 ken None 69 Nov 12 13:00 pm_11148149_storable_first_run.sto

ken@titan ~/tmp
$ ./pm_11148149_storable_first_run_1.pl
Perl version: v5.30.0
Serialised data:
{ key1 => "data1", key2 => "data2", key3 => "data3" }

ken@titan ~/tmp
$