[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] object-oriented (OO) programming object-oriented programming 2nd objects 2nd clearing from memory hash data structures instance of a class representation as hashes octal (base 8) numbers open system call opening files operators arithmetic assignment binding bitwise context and file test logicalconditionals and precedence of string or operator| (bitwise OR) logical or control flow, using for outputdirecting to STDOUT, STDERR and files functions for output, formatting with printf
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