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    a  A string with arbitrary binary data, will be null padded.
    A  A text (ASCII) string, will be space padded.
    Z  A null-terminated (ASCIZ) string, will be null padded.

print length pack '(A2)*', 'fr','ed','x';;
6
...

print unpack 'C*', pack '(Z2)*', 'fr','ed','x';;
102 0 101 0 120 0  ## Note! the 'r' & 'd' characters have been thrown 
+away? Another bug?

printf "'%s'\n", join"'", unpack '(A2)*', 'fredx';;
'fr'ed'x'
...

printf "'%s'\n", join"'", unpack '(Z2)*', 'fredx';;
'fr'ed'x'