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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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