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Index: 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 (user ID)
• • (see also $ variables, $; $ variables, $> variable)
  • Global Special Variables
  • chown
  • assumed : Talking to yourself
  • passwd file entry from : getpwuid
• $UID : (see $ variables, $)
• $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 _ (underscore))
• unequal : (see equality operators; relational operators)
• uninitialized variables : Singularities
• uninstall() : ExtUtils::Install - Install Files from Here to There
• UNIVERSAL class : Class Is Simply a Package
• UNIX
• • clients/servers : UNIX-domain clients and servers
  • security bugs : Security bugs
• unless statement : (see if statements)
• 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 loops)
• use declarations : (see pragmas)
• • use strict : Frequently Ignored Advice
  • use vars pragma : AutoLoader - Load Functions Only on Demand
• user CPU time
• • times
  • 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)

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