Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] I/O connections, filehandles if control structure elsif clause Image::Size module imaginary numbers import list, module functions in-place editing from command line incrementing autodecrement operator autoincrement operator postdecrements postincrements preincrements index function indices arrays substring location input <> (diamond) operator standard input user installing modules 2nd instructors integer literals nondecimal integer pragma integers interpolation arrays into strings double-quote patterns and scalar variables invocation arguments 2nd items in lists grep and map and |