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Index: U

• uid (user-ID): The stat and lstat Functions
• undef operator: The defined Function
• • slices and: Slices
• undef value: The undef Value
• underscore (_)
• • in integer literals: Integer Literals
  • in variable names: The use strict Pragma
• underscore filehandle: Using the Special Underscore Filehandle
• Unicode: Locales and Unicode
• Universal Time: The localtime Function
• Unix
• • input/output and: What Is a Filehandle?
  • model of files/directories and: Links and Files
  • portability and: Why Are There So Many Footnotes?
  • utilities for
  • • diamond operator and: Input from the Diamond Operator
    • regular expressions and: Concepts of Regular Expressions
• Unix password databases: Direct System Database Access
• Unix signals, sending/receiving: Sending and Receiving Signals
• unless control structure: The unless Control Structure
• unless modifier: Expression Modifiers
• • Expression Modifiers
• unlink operator: Removing Files
• unpack function: Manipulating Data with pack and unpack
• unquoted hash keys: Unquoted Hash Keys
• unshift operator: The shift and unshift Operators
• until control structure: The until Control Structure
• until modifier: Expression Modifiers
• • Expression Modifiers
• unwinding hashes: The Hash as a Whole
• uppercase
• • case shifting and: Case Shifting
  • vs. lowercase in variable names: Choosing Good Variable Names
• URLs
• • code in this tutorial: Code Examples
  • CPAN: What Is CPAN?
  • • Finding and Installing Modules
  • Perl Monastery: Are There Any Other Kinds of Support?
  • search interfaces for Perl: What Is CPAN?
• use directives: Finding and Installing Modules
• • pragmas and: Pragmas
• use strict pragma: The use strict Pragma
• • The strict Pragma
• user functions (see subroutines)
• user-ID, numeric ($uid): The stat and lstat Functions
• • changing file ownership and: Changing Ownership
• user-ID (uid): The stat and lstat Functions
• utilities
• • inside: Finding and Installing Modules
  • perlbug: What If I Find a Bug in Perl?
  • Unix (see Unix, utilities for)
  • which_dbm: DBM Files and DBM Hashes
• utime function: Changing Timestamps