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] [X] [Y] [Z] unary operators underscore (_) best practice identifiers and naming conventions readability and 2nd utility subroutines and uniq( ) subroutine 2nd UNIVERSAL class 2nd unless keyword unlock_hash( ) subroutine unlock_keys( ) subroutine unlock_value( ) subroutine unpack function 2nd unpacking best practices 2nd command lines exceptions until keyword USAGE template use base pragma use charnames pragma use constant pragma 2nd 3rd use English pragma $WARNINGS variable best practices comments and match variables punctuation variables and slurping and use Fatal pragma 2nd use IO::Handle pragma use only pragma use overload pragma use Readonly pragma 2nd use strict pragma barewords and 2nd declarative exporting and dereferencing and encapsulation and overview symbolic references and warning-free compilation and use version pragma use warnings pragma 2nd user documentation 2nd 3rd usleep( ) subroutine 2nd utilities 2nd utility subroutines best practice functionality listed naming conventions writing |