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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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