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## Index: H

h or H (hold) commands, sed editor: 34.17. The Deliberate Scrivener
  h command: 34.17. The Deliberate Scrivener
hacking: 1.2. Power Grows on You
handlers for DDoS attacks: 48.5. What We Mean by DoS
hangups (see HUP signals)
hangups, background processes and: 23.10. nohup
hard disk quota limits: 15.11. Disk Quotas
hard drives: 44.2. Reading Kernel Boot Output
hard links: 10.4. More About Links
  10.6. Stale Symbolic Links
  -i file in home directory for confirmation of file deletion: 14.8. Safer File Deletion in Some Directories
  broken: 10.5. Creating and Removing Links
  copying: 10.12. Copying Directory Trees with cp -r
  disk space and: 15.4. Save Space with a Link
  finding for files: 9.24. Finding the (Hard) Links to a File
  symbolic links vs.: 10.4.1. Differences Between Hard and Symbolic Links
  tar -l command, printing messages about: 15.7. Save Space: tar and compress a Directory Tree
  to .enter and .exit files: 31.13. Automatic Setup When You Enter/Exit a Directory
hardware: 44.1. Quick Introduction to Hardware
  dialup PPP sessions: 44.11. Setting Up a Dialup PPP Session
  disk partitioning: 44.4. Disk Partitioning
    PCs: 44.4. Disk Partitioning
  filesystem types and /etc/fstab: 44.5. Filesystem Types and /etc/fstab
  filesystems
    mounting NFS and SMBFS: 44.9. Mounting Network Filesystems — NFS, SMBFS
  kernel boot output for devices: 44.2. Reading Kernel Boot Output
  kernel configuration to support: 44.3. Basic Kernel Configuration
  modems: 44.10. Win Is a Modem Not a Modem?
  network devices, configuring: 44.8. Network Devices — ifconfig
  /proc filesystem files: 24.9.5. A Glimpse at Hardware
  serial consoles: 44.14. Decapitating Your Machine — Serial Consoles
  sound cards and other: 44.13. Dealing with Sound Cards and Other Annoying Hardware
  supported hardware lists: 44.13. Dealing with Sound Cards and Other Annoying Hardware
  USB configuration: 44.12. USB Configuration
hash codes: 16.4. Inside spell
hash command: 27.6. Controlling Shell Command Searches
hashes (Perl): 41.5. Perl Boot Camp, Part 2: Variables and Data Types
  41.5.3. Hashes
  functions for: 41.5.3. Hashes
  iterating over: 41.5.3. Hashes
head command: 8.15. newer: Print the Name of the Newest File
  12.12. Printing the Top of a File
  37.9. Making an Arbitrary-Size File for Testing
  43.12. What Can You Do with an Empty File?
  c option to print characters/bytes: 12.12. Printing the Top of a File
  GNU version, c nk and c nm options: 12.12. Printing the Top of a File
  n option to control number of lines displayed: 12.12. Printing the Top of a File
head of a pathname (:h operator): 28.5. String Editing (Colon) Operators
headers, mail
  creating with cat: 21.12.2. MIME Encoding
  proper formation of: 21.12.2. MIME Encoding
  removing with behead script: 21.5. Remove Mail/News Headers with behead
help: 2.1. The man Command
  command versions: 2.6. Which Version Am I Using?
  info commands: 2.9. The info Command
  man command: 2.1. The man Command
  searching online manual pages: 2.4. Searching Online Manual Pages
  terminals, tty command: 2.7. What tty Am I On?
  Unix system names: 2.5. How Unix Systems Remember Their Names
  whatis command: 2.2. whatis: One-Line Command Summaries
  whereis command: 2.3. whereis: Finding Where a Command Is Located
  who command: 2.8. Who's On?
help command (lpc): 45.3. Printer Control with lpc
here documents: 27.16. Here Documents
  28.13. Here Document Example #1: Unformatted Form Letters
hereis document terminators: 36.19. Quoted hereis Document Terminators: sh Versus csh
hgrep script: 13.16. A Highlighting grep
hidden files, listing with and ls -a and ls -A: 8.9. Showing Hidden Files with ls -A and -a
hierarchy, filesystem: 40.1. /usr/bin and Other Software Directories
highlighting: 8.6.1. Trying It
  hgrep script, using: 13.16. A Highlighting grep
  in shell prompts: 4.10. Highlighting and Color in Shell Prompts
histchars shell variable, changing history characters with: 30.15. Changing History Characters with histchars
histfile shell variable (tcsh): 3.3. Shell Setup Files — Which, Where, and Why
HISTFILESIZE environment variable: 30.12. Picking Up Where You Left Off
history command: 30.1. The Lessons of History
  -d and -f options, showing dates and times: 30.7. History by Number
  -D option, showing elapsed time: 30.7. History by Number
  -h option: 30.13. Pass History to Another Shell
  -r (reverse) option: 30.13. Pass History to Another Shell
    bash shell, cautions about using: 30.7. History by Number
  -w option: 30.13. Pass History to Another Shell
  listing specified number of previous commands: 30.7. History by Number
.history file: 30.12. Picking Up Where You Left Off
  tcsh shells: 3.3. Shell Setup Files — Which, Where, and Why
history number in shell prompts: 4.3. Dynamic Prompts
  30.2. History in a Nutshell
  30.7. History by Number
  multiline C-shell prompt: 4.7. Multiline Shell Prompts
history of commands: 1.6. There Are Many Shells
  30.1. The Lessons of History
  !$ sequence for safety with wildcards: 30.6. Using !$ for Safety with Wildcards
  changing history characters with histchars: 30.15. Changing History Characters with histchars
  checking with :p operator: 30.11. Check Your History First with :p
  history numbers: 30.7. History by Number
  history substitution
    !$ sequence: 30.3. My Favorite Is !$
    mkdir command, using with: 7.8. Making Directories Made Easier
    !:n* sequence: 30.4. My Favorite Is !:n*
  history substitutions: 30.8. History Substitutions
  narrowing searches with: 13.11. Narrowing a Search Quickly
  passing to other shells: 30.13. Pass History to Another Shell
  repeating commands with: 28.11. Repeating a Time-Varying Command
  saving history in history file: 30.12. Picking Up Where You Left Off
    bash, ksh, and zsh shells: 30.12.1. bash, ksh, zsh
    C shells: 30.12.2. C Shells
  shell command line-editing: 30.14. Shell Command-Line Editing
    bash: 30.14.5. bash Editing
    Emacs editing mode: 30.14.2. Emacs Editing Mode
    ksh (Korn shell): 30.14.4. ksh Editing
    tcsh shell: 30.14.3. tcsh Editing
    vi editing mode: 30.14.1. vi Editing Mode
    zsh: 30.14.6. zsh Editing
history shell variable: 35.9. Shell Variables
history substitution: 29.3. C-Shell Aliases with Command-Line Arguments
  30.2. History in a Nutshell
  30.8. History Substitutions
  disabling in bash: 30.16. Instead of Changing History Characters
  editing substitutions in C shells, zsh, and bash: 28.5. String Editing (Colon) Operators
  for loop, using for: 28.9.1. A foreach Loop
HISTSIZE environment variable: 30.1. The Lessons of History
  30.12. Picking Up Where You Left Off
HOBLink JWT RDP client: 47.9.3. Hob
hold (h or H) commands, sed editor: 34.14. Hold Space: The Set-Aside Buffer
  34.17. The Deliberate Scrivener
  h command: 34.17. The Deliberate Scrivener
HOLD SCREEN button: 5.6.1. Output Stopped?
hold space (sed editor): 34.17. The Deliberate Scrivener
  transforming part of a line, use in: 34.15. Transforming Part of a Line
home directory: 1.15. Your Home Directory
  bin subdirectory, creating: 7.4. A bin Directory for Your Programs and Scripts
  finding: 7.2. Many Homes
    31.11. Finding (Anyone's) Home Directory, Quickly
  HOME environment variable: 35.5. Predefined Environment Variables
  pathname of: 3.7. Use Absolute Pathnames in Shell Setup Files
$HOME environment variable: 3.7. Use Absolute Pathnames in Shell Setup Files
  7.2. Many Homes
$HOME/.rhosts file: 6.10.2. Starting a Remote Client with rsh and ssh
host allow directive: 47.2. Installing and Configuring Samba
host-based access control: 6.10.2. Starting a Remote Client with rsh and ssh
host-based modems: 44.10. Win Is a Modem Not a Modem?
host tool: 46.9. Domain Name Service (DNS)
hostname command: 2.5. How Unix Systems Remember Their Names
hostnames
  completion by shells: 28.6.3. Command-Specific Completion
  for IP address, finding with dig -x: 46.3. Status and Troubleshooting
  mapped to IP addresses by DNS: 46.9. Domain Name Service (DNS)
  NETBIOS: 47.2. Installing and Configuring Samba
  in shell prompts: 4.2. Static Prompts
    multiline C-shell prompt: 4.7. Multiline Shell Prompts
  showing with who am i command: 3.12. Terminal Setup: Testing Remote Hostname and X Display
hosts
  .cshrc.$HOST file for per host setup: 3.18. A .cshrc.$HOST File for Per Host Setup
  trusted-host authentication on SSH: 51.5. General and Authentication Problems
hosts.equiv file: 6.10.2. Starting a Remote Client with rsh and ssh
HTML: 45.13. Formatting Markup Languages — troff, LATEX, HTML, and So On
  converted into PostScript: 45.16. Converting Typeset Files into a Printing Language
  editing files with batch editing script: 20.7. ed/ex Batch Edits: A Typical Example
  file extensions: 1.12. Filename Extensions
htmllib and HTMLParser modules: 42.4. Python and the Web
HTMLParser module: 42.7. htmllib and HTMLParser
HTTP
  Emacs facility for: 19.2. Emacs Features: A Laundry List
  URI protocol types: 40.6.1. Configuring the sources.list File
hung terminals, fixing: 5.6. Checklist: Terminal Hangs When I Log In
  aborting programs: 5.6.5. Aborting Programs
  output stopped by HOLD SCREEN or SCROLL LOCK button: 5.6.1. Output Stopped?
  program waiting for input: 5.6.3. Program Waiting for Input?
  stalled data connection: 5.6.4. Stalled Data Connection?
  stopped jobs, checking for: 5.6.2. Job Stopped?
HUP (hangup) signals: 24.10. What Are Signals?
  24.13. Printer Queue Watcher: A Restartable Daemon Shell Script
  ignoring with nohup command: 23.10. nohup
.hushlogin file: 3.1. What Happens When You Log In
hyphen , under symbols) (see - (dash)
HZ constant, frequency of system time updates: 37.6. How Unix Keeps Time

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