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U

-u file test operator : Named Unary and File Test Operators
-U switch, perl : Switches
-u switch, perl : Switches
uc function : uc
ucfirst function : ucfirst
UDP communications : UDP: message passing
$UID (see $<; variable)
uid (user ID) (see also $<; variable; $>; variable)
chown
assumed : Talking to yourself
passwd file entry from : getpwuid
$uid file statistic : stat
umask function : umask
unary operators
Calling conventions for unary operations
Overloadable operations
arithmetic : Autoincrement and Autodecrement Operators
glob operator as : Filename globbing operator
ideographic : Ideographic Unary Operators
named
Filename globbing operator
Named Unary and File Test Operators
unbuffered input : getc
undef (value) : defined
undef function
undef
Time Efficiency
undefined
scalars : Scalar Values
Boolean context and : Boolean context
underscore (see _)
unequal (see equality operators; relational operators)
uninitialized
variables : Singularities
uninstall( ) : ExtUtils::Install--Install Files from Here to There
UNIVERSAL class : A Class Is Simply a Package
UNIX
clients/servers : UNIX-domain clients and servers
security bugs : Security bugs
unless statement (see if statement)
unlink function : unlink
unlinking (see deleting)
unordered lists (see hashes)
unpack function : unpack
unsafe operations : Switches
unshift function : unshift
untie function
dbmclose
untie
Using Tied Variables
until statement (see while loop)
use declarations (see pragmas)
use strict : Frequently Ignored Advice
use vars pragma : AutoLoader--Load Functions Only on Demand
user
CPU times : times
user CPU time : Notes
user efficiency : User Efficiency
user ID (see uid)
user-defined functions (see subroutines)
username
passwd file entry from : getpwnam
"uses" relationship : Implementation (the "Uses" Relationship)
utime function : utime
utmp file (see /etc/utmp file)


Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
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