in reply to understanding symbols

See $| in perlvar
perldoc -v '$|'

h0 is probably a HASHES OF ARRAYS data structure. The inner {} return the puts key. The outer {} dereference the array.

%{$hr1} dereferences a hash reference. See perlreftut

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Re^2: understanding symbols
by baperl (Sexton) on Aug 03, 2011 at 19:41 UTC
    thanks toolic, that helps :-)