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Index: U
- -u operator
: 10.5. The -x File Tests
- undef
- array element access and
: 3.4.2. Array Element Access
- assigning lists and
: 3.4.1. Assignment
- associative array elements and
: 5.2. Hash Variables
- to control dbmopen( )
: 17.2. Opening and Closing DBM Hashes
- as default value for $^I
: 17.5. Variable-Length ( Text) Databases
- definition of
: 2.9. The Undefined Value
- globbing return value
: 12.2. Globbing
- as initial value of local variables
: 8.5. Private Variables in Functions
- pop( ) return value
: 3.4.3. The push and pop Functions
- readdir( ) return value
: 12.5. Reading a Directory Handle
- resulting from split( )
: 7.6.1. The split Function
- STDIN and
: 6.1. Input from STDIN
- unless statement
: (see if statement)
- unlink( ) operator
: 13.1. Removing a File
- example of
: A.12. Chapter 13, File and Directory Manipulation
- unpack( ) operator
: 16.2. Packing and Unpacking Binary Data
- example of
- 16.3. Getting Network Information
- 17.4. Fixed-Length Random Access Databases
- gethostbyname( ) return values and
: 16.3. Getting Network Information
- unshift( ) operator
: 3.4.4. The shift and unshift Functions
- until statement
: (see while statement)
- up-arrow, in regular expressions
: 7.3.1. Single-Character Patterns
- uppercase for filehandles
: 1.5.10. Moving the Secret Word List into a Separate File
- URLs (uniform resource locators)
: 19. CGI Programming
- use statement
: 19.4. Passing Parameters via CGI
- Usenet (comp.lang.perl)
: Support
- user function
: (see subroutines)
- user ID
: 10.6. The stat and lstat Functions
- accessing information
: 16.1. Getting Password and Group Information
- username information, accessing
: 16.1. Getting Password and Group Information
- /usr/dict/words
: 7.7. Exercises
- utime( ) operator
: 13.7. Modifying Timestamps
- UUCP
: UUCP
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