Symbols & Numbers | 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

Index: U

/u directory: 31.11. Finding (Anyone's) Home Directory, Quickly

UAs (User Agents): 46.8. Mail — SMTP, POP, and IMAP

uc operator: 41.5.1. Scalars

UDP (User Datagram Protocol): 46.1. TCP/IP — IP Addresses and Ports

46.1.2. Layer 4 Protocols: TCP, UDP, and ICMP

UIDs (see user IDs)

ulimit -f command: 15.5.1. limit and ulimit

umask command: 31.13. Automatic Setup When You Enter/Exit a Directory

default mode for newly created files: 49.4. Setting an Exact umask

permission values, setting: 50.2.1. User, Group, and World

setting in shell scripts: 24.4. Subshells

subshell, running in: 36.27. Shell Lockfile

umount command: 44.6. Mounting and Unmounting Removable Filesystems

unalias command: 29.4. Setting and Unsetting Bourne-Type Aliases

uname -n command: 2.5. How Unix Systems Remember Their Names

uncompressing files: 15.6. Compressing Files to Save Space

bunzip2 program: 15.6. Compressing Files to Save Space

underscore (_) in filenames: 1.11. Filenames

undoing

actions in Emacs editor: 19.1. Emacs: The Other Editor

deletions with vi editor: 17.7. Get Back What You Deleted with Numbered Buffers

edits in vi editor: 17.29. Finding Your Place with Undo

search and replace commands with vi editor: 17.9. Confirming Substitutions in vi

unformatted manpage files: 2.4. Searching Online Manual Pages

uniq command: 21.20. What Is (or Isn't) Unique?

sort -u vs.: 22.6.1. Dealing with Repeated Lines

testing for duplicate terms: 16.7. Find a a Doubled Word

Universal Serial Bus (USB): 44.12. USB Configuration

Unix

advantages of: 1.1. What's Special About Unix?

1.2. Power Grows on You

communicating with: 1.4. Communication with Unix

networking and communications utilities: 1.21. Unix Networking and Communications

priority, definition of: 26.5. Know When to Be "nice" to Other Users...and When Not To

versions of: 0.6. About Unix Versions

unkillable processes, cleaning up: 24.18. Cleaning Up an Unkillable Process

unless statements: 41.6. Perl Boot Camp, Part 3: Branching and Looping

unlimit coredumpsize command: 15.5.1. limit and ulimit

unlink( ) system call: 14.14. Using unlink to Remove a File with a Strange Name

unlink function: 41.8. Perl Boot Camp, Part 5: Perl Knows Unix

unlocking files (RCS): 39.5. RCS Basics

unmatched pieces of code, errors caused by: 37.1.4. Missing or Extra esac, ;;, fi, etc.

unset -f command, deleting definition of function: 29.11.5. Conclusion

unset variables, errors caused by: 37.3. Stop Syntax Errors in Numeric Tests

unsetenv command: 35.3. What Environment Variables Are Good For

unshift operator (Perl): 41.5.2. Arrays

until loops: 31.6. Loop Control: break and continue

nonzero exit status: 36.27. Shell Lockfile

test command used with: 35.26. test: Testing Files and Strings

testing exit status in Bourne shells: 35.15.1. Looping Until a Command Succeeds

while loops vs.: 35.15.2. Looping Until a Command Fails

updatedb shell script: 9.20. Finding Files (Much) Faster with a find Database

updating

CVS files: 39.7. CVS Basics

39.8. More CVS

distributed database: 11.11. Even More Uses for make

information on available packages with apt-get: 40.6.2.1. Updating information on available packages

upgrading installed packages with apt-get: 40.6.2.3. Upgrading installed packages

uppercase (see case)

uptime command: 4.16. Preprompt, Pre-execution, and Periodic Commands

26.1. Timing Is Everything

26.4. Checking System Load: uptime

URI for software package source: 40.6.1. Configuring the sources.list File

urllib module: 42.4. Python and the Web

URLs for Java applet VNC desktops: 47.7.1. Connecting to a Windows VNC server

USB (Universal Serial Bus): 44.12. USB Configuration

Usenet: 1.21. Unix Networking and Communications

eight-bit text, encoding into seven-bit: 21.12. Encoding "Binary" Files into ASCII

GNUS client in Emacs: 19.2. Emacs Features: A Laundry List

User Agents (UAs): 46.8. Mail — SMTP, POP, and IMAP

user-based access control: 6.10.2. Starting a Remote Client with rsh and ssh

User Datagram Protocol (see UDP)

user defined subroutines (Perl): 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

USER environment variable: 35.5. Predefined Environment Variables

user IDs (UIDs): 24.3. Managing Processes: Overall Concepts

in passwd file: 49.2. When Does a User Become a User

user interfaces (see GUIs)

-user operator (find command): 9.16. Searching by Owner and Group

user-space tools to configure devices: 44.1. Quick Introduction to Hardware

user time: 26.2. Timing Programs

useradd utility: 49.2. When Does a User Become a User

username field in crontab entries: 25.2.1. Execution Scheduling

users

backing up directories: 38.5.1. What to Back Up

login shell, killing: 24.12. Destroying Processes with kill

RCS files, listing for: 39.5. RCS Basics

UID: 49.2. When Does a User Become a User

Unix user/group infrastructure: 49.1. Unix User/Group Infrastructure

adding to Unix systems: 49.2. When Does a User Become a User

disabling logins: 49.13. Disable logins

file ownerhsip and: 50.2.1. User, Group, and World

group permissions in directory with setgid bit: 49.5. Group Permissions in a Directory with the setgid Bit

groups and group ownership: 49.6. Groups and Group Ownership

groups that deny permissions: 49.7. Add Users to a Group to Deny Permissions

substitute identity with su: 49.9. Substitute Identity with su

SUID and SGID scripts: 49.8. Care and Feeding of SUID and SGID Scripts

superpowers with sudo application: 49.11. Providing Superpowers with sudo

usernames: 49.2. When Does a User Become a User

in shell prompt: 4.2. Static Prompts

users command: 35.25.2. Setting (and Parsing) Parameters

/usr directory: 40.1. /usr/bin and Other Software Directories

/usr/bin directory: 40.1. /usr/bin and Other Software Directories

local programs and: 10.7. Linking Directories

programs in: 1.9. Internal and External Commands

/usr/bsd directory, remote shell (rsh): 6.10.2. Starting a Remote Client with rsh and ssh

/usr/dict/words file: 16.3. How Do I Spell That Word?

/usr/lib/crontab file: 25.2.1. Execution Scheduling

/usr/lib/crontab.local file: 25.2.1. Execution Scheduling

/usr/libexec/makewhatis file: 2.2. whatis: One-Line Command Summaries

/usr/lib/spell directory: 16.4. Inside spell

/usr/lib/X11/app-defaults file: 6.9. Listing the Current Resources for a Client: appres

/usr/local directory: 10.7. Linking Directories

/usr/local/bin directory: 40.1. /usr/bin and Other Software Directories

/usr/local/man directory: 2.4. Searching Online Manual Pages

/usr/man directory: 2.4. Searching Online Manual Pages

/usr/share/man directory: 2.4. Searching Online Manual Pages

utilities: 35.2. Everyone Should Learn Some Shell Programming

(see also individual utility or command names)

combining: 35.2. Everyone Should Learn Some Shell Programming

relationship with kernel, shell, and applications: 1.4. Communication with Unix

UUCP (Unix-to-Unix copy): 1.21. Unix Networking and Communications

uudecode command: 21.12.1. uuencoding

uuencode utility: 21.12.1. uuencoding

uuencoding: 21.12. Encoding "Binary" Files into ASCII

uuname -l command: 2.5. How Unix Systems Remember Their Names

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