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# Index: U

-unique_headers flag: 5.5.3. Error Subroutines (CGI Programming with Perl)
-u flag (Apache: The Definitive Guide): 2.2. Apache's Flags (apache)
UCASE( ) function: 15.1. MySQL SQL (MySQL & mSQL)
UDP (User Datagram Protocol): 15.1.1. TCP/IP Concepts (Running Linux)
UFS filesystem: 6.1.1. Filesystem Types (Running Linux)
uid (see users)
UIDs (user IDs), NFS, NIS and: 15.4.1. Configuring NFS (Running Linux)
UINT datatype: 15.2. mSQL SQL (MySQL & mSQL)
<ul> HTML tag: 16.1.4.6. More HTML features (Running Linux)
ul command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
ulimit command (bash): 7.7. Built-in Commands (Linux in a Nutshell)
ultra-thin clients: 8.4. The Three-tier Architecture (MySQL & mSQL)
UltraSPARC systems: F.1.4. UltraSPARC 64-bit Systems (Running Linux)
  F.5. SPARC-specific Issues After Installation (Running Linux)
umask( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
  18.2. Lite (MySQL & mSQL)
  18.2. Lite (MySQL & mSQL)
umask command (bash): 7.7. Built-in Commands (Linux in a Nutshell)
umask command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
UML (Unified Modeling Language): 13.2. Object-oriented Database Access in C++ (MySQL & mSQL)
umount command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  6.1.2. Mounting Filesystems (Running Linux)
UMSDOS filesystem: 6.1.1. Filesystem Types (Running Linux)
unabbreviate command (ex): 11.13. Alphabetical Summary of ex Commands (Linux in a Nutshell)
"unable to get hostbyname" error: 2.4. Setting Up a Unix Server (Apache: The Definitive Guide)
unalias command (bash): 7.7. Built-in Commands (Linux in a Nutshell)
unalias command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
uname command: 7.4. Building a New Kernel (Running Linux)
uname2id( ): 14.6.13. User and Group Functions (Apache: The Definitive Guide)
unblock_alarms( ): 14.6.16. Timeout and Alarm Functions (Apache: The Definitive Guide)
unbuffering output stream: 15.2.6. Unbuffer Output Stream (CGI Programming with Perl)
uncomplete command (tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
uncompress command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
uncompress program: 7.1.1. Using gzip and bzip2 (Running Linux)
uncompressing (see compression, file)
uncompressing files (see compression)
undef vs. ( ): 17.1.5. undef Versus ( ) (CGI Programming with Perl)
underscores (_)
  filenames, replacing characters with: 5.2.4. File Uploads with CGI.pm (CGI Programming with Perl)
  nonalphanumeric parameter name characters, replacing with: 5.2.3. Exporting Parameters to a Namespace (CGI Programming with Perl)
  use in Perl: 16.2. Coding Guidelines (CGI Programming with Perl)
underscores/underlining: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
undo command (Emacs): 11.4.7. Emacs (Running Linux)
undo command (ex): 11.13. Alphabetical Summary of ex Commands (Linux in a Nutshell)
undoing edits (vi editor): 9.1.3. Deleting Text and Undoing Changes (Running Linux)
undoing, Emacs commands for: 10.3.5. Stopping and Undoing Commands (Linux in a Nutshell)
unedit command (CVS): 14.4.7.21. unedit (Linux in a Nutshell)
unescape_url( ): 14.6.12. Path, Filename, and URL Manipulation Functions (Apache: The Definitive Guide)
unexpand command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
unformatted menus: 7.3.5. ImapMenu (Apache: The Definitive Guide)
unhash command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
Unicode-compliant data transport, XML: 14.2. An Introduction to XML (CGI Programming with Perl)
Uniform Resource Locators (URLs): 16.1. The World Wide Web (Running Linux)
uniq command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
uniqid( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
UNIQUE attribute: 15.1. MySQL SQL (MySQL & mSQL)
unique identifiers (see primary keys)
  generating for sessions: 11.2. Hidden Fields (CGI Programming with Perl)
  in hidden field: 11.2. Hidden Fields (CGI Programming with Perl)
  inserting into HTML documents, module for: 11.1. Query Strings and Extra Path Information (CGI Programming with Perl)
  mod_unique_id module, building with: 11.1. Query Strings and Extra Path Information (CGI Programming with Perl)
  passing with HTTP requests: 11. Maintaining State (CGI Programming with Perl)
unique_id_child_init( ): 15.3.7.1. Example (Apache: The Definitive Guide)
UNIREG: 1.4.2. The History of MySQL (MySQL & mSQL)
Unisys patent on LZW compression algorithm: 13.1.1.1. The LZW patent (CGI Programming with Perl)
University Ingres: 7.3. PostgreSQL (MySQL & mSQL)
Unix: 1.1. The Excitement of Linux (Linux in a Nutshell)
  1.2. A Brief History of Linux (Running Linux)
  commands: 1.5.1. Basic Commands and Utilities (Running Linux)
    4. Basic Unix Commands and Concepts (Running Linux)
  commercial implementations of: 1.8.4. Other Implementations of Unix (Running Linux)
  Perl language: 13.4. Using Perl (Running Linux)
UNIX file systems: 4.4.1.1. Database creation (MySQL & mSQL)
Unix operating system
  binmode function, not supporting: 13.2.1.1. binmode (CGI Programming with Perl)
  ColdFusion language, versions for: 1.3.2. Alternatives to CGI (CGI Programming with Perl)
  commands to locate perl: 15.1.2. The Pound-Bang (CGI Programming with Perl)
  configuring server: 2.4. Setting Up a Unix Server (Apache: The Definitive Guide)
  DBM files: 5.5.1. DBM Files on Unix (Apache: The Definitive Guide)
  executable files, commands for: 1.2.2. Invoking CGI Scripts (CGI Programming with Perl)
  executables, differentiating in filesystem: 1.2.2. Invoking CGI Scripts (CGI Programming with Perl)
  file limits: 3.6.6. Unix File Limits (Apache: The Definitive Guide)
  file permissions: 10.1.2. Write Permissions (CGI Programming with Perl)
  forward slashes (/) separating directories: 12.3.1. Search Application (CGI Programming with Perl)
  making Apache: 1.8.5. Making Apache (Apache: The Definitive Guide)
  multiple IP addresses: 1.3.1. Multiple Sites: Unix (Apache: The Definitive Guide)
  passwords: 5.3. Passwords Under Unix (Apache: The Definitive Guide)
  Perl
    linefeed and carriage return, representing on: 3.3.1.1. Outputting documents (CGI Programming with Perl)
    speediness on: 1.3.1. Why Perl? (CGI Programming with Perl)
  permissions: 2.4.4. Unix Permissions (Apache: The Definitive Guide)
  restarting Apache: 3.12. Restarts (Apache: The Definitive Guide)
  sendmail on: 9.4. sendmail (CGI Programming with Perl)
  suEXEC wrapper: 4.7. suEXEC on Unix (Apache: The Definitive Guide)
  uptime command: 13.3.2. Using GD (CGI Programming with Perl)
  variables (see environment variables)
  versions of: 1.6. Which Unix? (Apache: The Definitive Guide)
  virtual hosts: 3.6. Controlling Virtual Hosts on Unix (Apache: The Definitive Guide)
UNIX socket: 4.4.1.4. Server status (MySQL & mSQL)
UNIX version of mSQL: 5.3. Installing mSQL (MySQL & mSQL)
UNIX_Port variable: 16.2.2.1. general (MySQL & mSQL)
unixtime2( ) function: 18.2. Lite (MySQL & mSQL)
  18.2. Lite (MySQL & mSQL)
UNIX_TIMESTAMP( ) function: 15.1. MySQL SQL (MySQL & mSQL)
unlimit command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
unlink( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
  18.2. Lite (MySQL & mSQL)
  18.2. Lite (MySQL & mSQL)
unloading modules: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
UNLOCK statement: 15.1. MySQL SQL (MySQL & mSQL)
unmap command (ex): 11.13. Alphabetical Summary of ex Commands (Linux in a Nutshell)
unmask command: 4.14. Changing the Owner, Group, and Permissions (Running Linux)
unmounting filesystems: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  6.1.2. Mounting Filesystems (Running Linux)
unnumbered lists in HTML: 16.1.4.6. More HTML features (Running Linux)
unpack( ): 2.4.1. Querying Data (Programming the Perl DBI)
  Data::Dumper module and: 2.5.1. The Perl Data::Dumper Module (Programming the Perl DBI)
  Perl objects and: 2.7.3.2. Packing in Perl objects (Programming the Perl DBI)
unpacked directory (on CD-ROM): 0.2. The Demonstration CD-ROM (Apache: The Definitive Guide)
unpacking (see compression)
unsafe option (LILO): G.2. Image Options (Running Linux)
unset( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
unset command (bash): 7.7. Built-in Commands (Linux in a Nutshell)
unset command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
unseten command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
unsetenv command (csh/tcsh): 8.9. Built-in csh and tcsh Commands (Linux in a Nutshell)
unshar command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
UNSIGNED attribute: 6.3. SQL Datatypes (MySQL & mSQL)
  15.1. MySQL SQL (MySQL & mSQL)
unsolicited bulk email (see spam)
unstr command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
untainting data: 8.4.3. How Taintedness Is Removed (CGI Programming with Perl)
  fgrep command search: 12.1. Searching One by One (CGI Programming with Perl)
until command (bash): 7.7. Built-in Commands (Linux in a Nutshell)
untying hash tables from database files: 10.2.1. DB_File (CGI Programming with Perl)
up|upd commands (CVS) (see update command (CVS))
up command (lpc): 8.4.12. Controlling Printer Services with lpc (Running Linux)
update command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
update command (CVS): 14.4.7.22. update (Linux in a Nutshell)
  status codes: 14.4.7.22. update (Linux in a Nutshell)
Update Log: 4.4.2. Backups (MySQL & mSQL)
update program: 5.5. Shutting Down the System (Running Linux)
update query screen: 10.4.2.2. Address book CGI script (CGI Programming with Perl)
UPDATE SQL statement: 3.4.3. Updating Data (Programming the Perl DBI)
UPDATE statement: 10.4. MysqlPerl (MySQL & mSQL)
  15.1. MySQL SQL (MySQL & mSQL)
  15.2. mSQL SQL (MySQL & mSQL)
updateAsciiStream( ) method: 22. JDBC Reference (MySQL & mSQL)
updateBigDecimal( ) method: 22. JDBC Reference (MySQL & mSQL)
updateBinaryStream( ) method: 22. JDBC Reference (MySQL & mSQL)
updateBoolean( ) method: 22. JDBC Reference (MySQL & mSQL)
updateByte( ) method: 22. JDBC Reference (MySQL & mSQL)
updateBytes( ) method: 22. JDBC Reference (MySQL & mSQL)
updateCharacterStream( ) method: 22. JDBC Reference (MySQL & mSQL)
updateDate( ) method: 22. JDBC Reference (MySQL & mSQL)
updateDouble( ) method: 22. JDBC Reference (MySQL & mSQL)
updateFloat( ) method: 22. JDBC Reference (MySQL & mSQL)
updateInt( ) method: 22. JDBC Reference (MySQL & mSQL)
updateLong( ) method: 22. JDBC Reference (MySQL & mSQL)
updateNull( ) method: 22. JDBC Reference (MySQL & mSQL)
updateObject( ) method: 22. JDBC Reference (MySQL & mSQL)
Update.prog file (CVS): 14.4.4.3. CVS directories (Linux in a Nutshell)
updateRow( ) method: 22. JDBC Reference (MySQL & mSQL)
updateShort( ) method: 22. JDBC Reference (MySQL & mSQL)
updateString( ) method: 22. JDBC Reference (MySQL & mSQL)
updateTime( ) method: 22. JDBC Reference (MySQL & mSQL)
updateTimestamp( ) method: 22. JDBC Reference (MySQL & mSQL)
updating databases: 10.3.4. Updating Data (CGI Programming with Perl)
updating HTML documents with links: 5.3.1.4. Specifying an alternative target (CGI Programming with Perl)
upgrading: 7.2. Upgrading Software (Running Linux)
  compiler: 7.2.2. Upgrading the Compiler (Running Linux)
  kernel patches: 7.4.1.2. Applying patches (Running Linux)
  libraries: 7.2.1. Upgrading Libraries (Running Linux)
upload method (CGI.pm): 5.2.4. File Uploads with CGI.pm (CGI Programming with Perl)
UPLOAD_DIR: 5.2.4. File Uploads with CGI.pm (CGI Programming with Perl)
uploading files, handling with CGI.pm: 5.2.4. File Uploads with CGI.pm (CGI Programming with Perl)
UPPER( ) function: 15.1. MySQL SQL (MySQL & mSQL)
uppercase (see case)
uppercase attribute names: 6.1.3. The Significance of Case (Programming the Perl DBI)
uppercase, use in request methods: 2.3.1. The Request Line (CGI Programming with Perl)
UPS debugger: 14.2.1. Debuggers (Running Linux)
UPS (Uninterruptible Power Supply): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
uptime command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
Uptime, MySQL server status: 4.4.1.4. Server status (MySQL & mSQL)
uptime Unix system command: 13.3.2. Using GD (CGI Programming with Perl)
  13.3.2. Using GD (CGI Programming with Perl)
URI module: 14.1.2. IO::Socket (CGI Programming with Perl)
uri_components structure: 14.6.23. URI Functions (Apache: The Definitive Guide)
URIs (Uniform Resource Identifiers): 2.1. URLs (CGI Programming with Perl)
URI::URL module: 2.1.3. URL Encoding (CGI Programming with Perl)
URL-escaped special characters: 10.3. Msql.pm (MySQL & mSQL)
URL handlers, setting (GNOME): 15.4.3.3. URL handlers (Linux in a Nutshell)
URL links
  GNOME desktop, adding to: 15.1.1. Adding Desktop Icons (Linux in a Nutshell)
  KDE desktop, adding to: 16.1.3. Adding a Link to the Desktop (Linux in a Nutshell)
    16.1.3. Adding a Link to the Desktop (Linux in a Nutshell)
  setting colors for: 16.3.1.2. File manager (Linux in a Nutshell)
url method (CGI.pm): 5.2.1.6. url (CGI Programming with Perl)
urldecode( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
urlencode( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
url_escape and url_unescape functions: 2.1.3. URL Encoding (CGI Programming with Perl)
URLs (uniform resource locators): 1. Getting Started (Apache: The Definitive Guide)
  API functions for: 14.6.12. Path, Filename, and URL Manipulation Functions (Apache: The Definitive Guide)
  digest authentication: 5.1. Authentication Protocol (Apache: The Definitive Guide)
    5.7. Digest Authentication (Apache: The Definitive Guide)
  imagemaps: 7.3.1. ImapBase (Apache: The Definitive Guide)
  limiting directives to: 3.3.4. < Location> and < LocationMatch> (Apache: The Definitive Guide)
  redirecting upon errors: 3.1.1. ErrorDocument (Apache: The Definitive Guide)
  rewriting: 8.8. Rewrite (Apache: The Definitive Guide)
    12.9. URL Rewriting (Apache: The Definitive Guide)
  spell-checking: 8.9. Speling (Apache: The Definitive Guide)
    12.10. Miscellaneous (Apache: The Definitive Guide)
  translating to names: 15.3.9. Translate Name (Apache: The Definitive Guide)
URNs (Uniform Resource Names): 2.1. URLs (CGI Programming with Perl)
use command: 17.1. MySQL Utilities (MySQL & mSQL)
use DBI program: 21.2. DBI.pm API (MySQL & mSQL)
use Msql program: 21.3. Msql.pm API (MySQL & mSQL)
use statement: 10.4.1.1. Connecting to DBI (CGI Programming with Perl)
use strict command: 1.2.1. Sample CGI (CGI Programming with Perl)
use vars statement: 10.4.2.2. Address book CGI script (CGI Programming with Perl)
UseCanonicalName directive: 3.4.2. UseCanonicalName (Apache: The Definitive Guide)
Usenet (see news)
USER( ) function: 15.1. MySQL SQL (MySQL & mSQL)
user agent, creating with LWP: 14.1.3. LWP (CGI Programming with Perl)
User-Agent field: 2.3.2.5. User-Agent (CGI Programming with Perl)
User Agent tab, KDE Control Center: 16.3.1.3. Web browser (Linux in a Nutshell)
User Datagram Protocol (UDP): 15.1.1. TCP/IP Concepts (Running Linux)
User directive: 2.4.1.1. User (Apache: The Definitive Guide)
USER environment variable: 16.2.1. Environment Variables (MySQL & mSQL)
user file, user names and encrypted passwords in: 2.3.2.4. Authorization (CGI Programming with Perl)
user groups: 0.1.5. Linux User Groups (Linux in a Nutshell)
user ID: 5.7.1. The passwd File (Running Linux)
  5.7.7. Modifying User Accounts (Running Linux)
user interface settings, GNOME: 15.4.7. User Interface (Linux in a Nutshell)
user interfaces: 8.4. The Three-tier Architecture (MySQL & mSQL)
User menu, GNOME: 15.3. The Main Menu (Linux in a Nutshell)
User, MySQL server status: 4.4.1.4. Server status (MySQL & mSQL)
user names: 4.4.3.1. The user table (MySQL & mSQL)
user permissions: 9.4.2. Security (MySQL & mSQL)
user registration form (example): 7.2.1.3. Validation example (CGI Programming with Perl)
user session: 11. Maintaining State (CGI Programming with Perl)
_user system variable: 6.8.2. mSQL Features (MySQL & mSQL)
user table: 4.4.3.1. The user table (MySQL & mSQL)
useradd command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
useradd program: 3.2.1. Creating a User Account (Running Linux)
  5.7.5. Creating Accounts (Running Linux)
userdel command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  5.7.6. Deleting and Disabling Accounts (Running Linux)
UserDir directive: 8.5. UserDir (Apache: The Definitive Guide)
  16.1.3.2. srm.conf (Running Linux)
usermod command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  5.7.7. Modifying User Accounts (Running Linux)
Username: 5.5.1.4. Server status (MySQL & mSQL)
$username argument: A.3.1. DBI Class Methods (Programming the Perl DBI)
usernames: 2.4.2.10. WWW-Authenticate (CGI Programming with Perl)
  3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  5.7.1. The passwd File (Running Linux)
users: 5.7.4. The Group File (Running Linux)
  (see also groups)
  accounts: 3.2.1. Creating a User Account (Running Linux)
    4.1. Logging In (Running Linux)
    5.7. Managing User Accounts (Running Linux)
    creating/deleting: 5.7.5. Creating Accounts (Running Linux)
  administration commands for: 2.1.15. Users (Linux in a Nutshell)
  API functions for: 14.6.13. User and Group Functions (Apache: The Definitive Guide)
  authentication and identification (script): 3.4.2. User Authentication and Identification (CGI Programming with Perl)
  automatic information on: 5.10. Automatic User Information (Apache: The Definitive Guide)
  backing up directories: 8.1.1. Simple Backups (Running Linux)
  changing group identification of: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  checking if access allowed: 15.3.13. Check User ID (Apache: The Definitive Guide)
  creating: 2.4.1. Webuser and Webgroup (Apache: The Definitive Guide)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  for cron tasks: 8.2. Scheduling Jobs Using cron (Running Linux)
  DBM files: 5.5.1. DBM Files on Unix (Apache: The Definitive Guide)
  deleting: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  email permissions, security risks of: 9.1.2. False Identities (CGI Programming with Perl)
  error information, limiting view of: 5.5.2. CGI::Carp (CGI Programming with Perl)
  finger command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  getting information about: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  groups, displaying: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  home directories: 8.5. UserDir (Apache: The Definitive Guide)
  input, tainted data, checking for: 8.4.1. How Taint Works (CGI Programming with Perl)
  input from
    handling securely: 8.2. Handling User Input (CGI Programming with Perl)
    untainting: 8.4.3. How Taintedness Is Removed (CGI Programming with Perl)
  listing: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  log of those logged in: 8.3. Managing System Logs (Running Linux)
  logged-in, report on: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  logging in: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  NIS accounts: 2.7.3. NIS User Accounts (Linux in a Nutshell)
  notifying of incoming mail: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  permissions (see permissions)
    4.13. File Ownership and Permissions (Running Linux)
  root: 5.1. Running the System (Running Linux)
    5.7.1. The passwd File (Running Linux)
  security and: 13.1. Internal and External Users (Apache: The Definitive Guide)
  sending messages to: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  on specific host, listing: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  su command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  talking to: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  tracking: 11. Maintaining State (CGI Programming with Perl)
  user ID: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
  web servers running as: 9.4.1. Command-Line Options (CGI Programming with Perl)
  writing to: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
    3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
users command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
users file (CVS): 14.3.3.15. The users file (Linux in a Nutshell)
usleep( ) function: 18.1. PHP (MySQL & mSQL)
  18.1. PHP (MySQL & mSQL)
usleep command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
/usr directory
  /usr/bin directory: 4.16. Important Directories (Running Linux)
    16.2.1.4. smail EDITME file (Running Linux)
  /usr/bin/apsfilter directory: 8.4.9. Magic Filters: APSfilter and Alternatives (Running Linux)
  /usr/include directory: 4.16. Important Directories (Running Linux)
  /usr/lib directory: 4.16. Important Directories (Running Linux)
    8.1.1. Simple Backups (Running Linux)
    13.1.7. More Fun with Libraries (Running Linux)
  /usr/lib/autofs directory: 6.1.3. Automounting Devices (Running Linux)
  /usr/local directory: 4.16. Important Directories (Running Linux)
  /usr/man directories: 9.3.2.2. Formatting and installing the manual page (Running Linux)
  /usr/sbin directory: 4.16. Important Directories (Running Linux)
  /usr/src directory: 4.16. Important Directories (Running Linux)
    7.2.3. Upgrading Other Software (Running Linux)
  /usr/src/linux directory: 7.4. Building a New Kernel (Running Linux)
    8.1.1. Simple Backups (Running Linux)
  /usr/X11R6 directory: 10.3. Installing XFree86 (Running Linux)
  /usr/X11R6/lib/X11 file: 4.16. Important Directories (Running Linux)
    8.1.1. Simple Backups (Running Linux)
utility functions
  numeric testing: 4.6.4. Numeric Testing (Programming the Perl DBI)
  string formatting: 4.6.3. Neat and Tidy Formatting (Programming the Perl DBI)
utility methods: 4.6.1. Database-Specific Quote Handling (Programming the Perl DBI)
  DBI execution tracing: 4.6.2. Tracing DBI Execution (Programming the Perl DBI)
  fetching and printing data: 5.1.3.1. A quick way to fetch and print (Programming the Perl DBI)
  quote handling: 4.6.1. Database-Specific Quote Handling (Programming the Perl DBI)
utmp file: 8.3. Managing System Logs (Running Linux)
UUCP (Unix to Unix Copy): 1.5.7. Networking (Running Linux)
uudecode( ): 14.6.11. String Functions (Apache: The Definitive Guide)
uudecode command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
uuencode command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)

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