U

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]

undef scalar variable
undef values, elements of arrays
Unicode support
unless control structure
     else clause
unquoted hash keys
unshift operator
until control structure
unwinding hashes
updating multiple files
use strict pragma
user input
user-defined functions, subroutines