$ pda set a1 1
$ pda set a2 2
$ pda set b1 3
$ pda dump --key "a*"
{"key":"a1","value":"1","encoding":"text"}
{"key":"a2","value":"2","encoding":"text"}
$ pda dump --key "c*" --> FAIL
FAIL  cannot ls '@default': no matches for key pattern 'c*'