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Index: U

-u file test operator : 2.5.10. Named Unary and File Test Operators

-u switch, perl : 6.1.2. Switches

-U switch, perl : 6.1.2. Switches

uc function : 3.2.177. uc

ucfirst function : 3.2.178. ucfirst

UDP communications : 6.2.4.3. UDP: message passing

uid (user ID)

(see also $ variables, $< variable; $ variables, $> variable)
2.9.3. Global Special Variables
3.2.15. chown
assumed : 6.2.2.2. Talking to yourself
passwd file entry from : 3.2.63. getpwuid

$UID : (see $ variables, $< variable)

$uid file statistic : 3.2.159. stat

umask function : 3.2.179. umask

unary operators

7.2.48.2. Calling conventions for unary operations

7.2.48.3. Overloadable operations

arithmetic : 1.5.4. Autoincrement and Autodecrement Operators

glob operator as : 2.3.7.3. Filename globbing operator

ideographic : 2.5.5. Ideographic Unary Operators

named

2.3.7.3. Filename globbing operator
2.5.10. Named Unary and File Test Operators

unbuffered input : 3.2.43. getc

undef (value) : 3.2.25. defined

undef function

3.2.180. undef
8.3.1. Time Efficiency

undefined scalars : 2.3.2. Scalar Values

Boolean context and : 2.3.3.2. Boolean context

underscore : (see _ (underscore))

unequal : (see equality operators; relational operators)

uninitialized variables : 1.2.1.1. Singularities

uninstall() : 7.2.16. ExtUtils::Install - Install Files from Here to There

UNIVERSAL class : 5.3.4. A Class Is Simply a Package

UNIX

clients/servers : 6.2.4.2. UNIX-domain clients and servers
security bugs : 6.3.1.3. Security bugs

unless statement : (see if statements)

unlink function : 3.2.181. unlink

unlinking : (see deleting)

unordered lists : (see hashes)

unpack function : 3.2.182. unpack

unsafe operations : 6.1.2. Switches

unshift function : 3.2.183. unshift

untie function

3.2.23. dbmclose
3.2.184. untie
5.4. Using Tied Variables

until statement : (see while loops)

use declarations : (see pragmas)

use strict : 8.2.2. Frequently Ignored Advice
use vars pragma : 7.2.2. AutoLoader - Load Functions Only on Demand

user CPU time

3.2.174. times
7.2.4.1. Notes

user efficiency : 8.3.6. User Efficiency

user ID : (see uid)

user-defined functions : (see subroutines)

username, passwd file entry from : 3.2.62. getpwnam

"uses" relationship : 5.5.7. Implementation (the "Uses" Relationship)

utime function : 3.2.186. utime

utmp file : (see /etc/utmp file)

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