[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] false or true value, evaluating with conditionals FASTA header file test operators filehandles output FileIO.pm AUTOLOAD method constructor method read method stat and localtime functions test program write method files directing output to graphics formats 2nd input from named on command line opening first normal form $flag variable floating-point numbers for loops foreach loops foreign keys format function formatting output using printf forward slash (/) fractions FTP functional dependencies functions, built-in |