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: Symbols & Numbers

Symbols

< > (angle brackets)

> as Bourne shell secondary prompt: 28.9.2. A for Loop

> (greater than) operator: 36.21.1. Syntax

41.5.1. Scalars

>= (greater than or equal to) operator: 20.10.7. Alphabetical Summary of Commands

36.21.1. Syntax

41.5.1. Scalars

> (redirection) operator: 43.5. Redirection in C Shell: Capture Errors, Too?

> tcsh shell prompt: 1.7. Which Shell Am I Running?

>& (redirection) operator: 43.5. Redirection in C Shell: Capture Errors, Too?

>> (Unix redirect and append) operator: 17.12. Appending to an Existing File

< (less than) operator: 20.10.7. Alphabetical Summary of Commands

36.21.1. Syntax

41.5.1. Scalars

<= (less than or equal to) operator: 20.10.7. Alphabetical Summary of Commands

36.21.1. Syntax

41.5.1. Scalars

< redirection character: 43.2. One Argument with a cat Isn't Enough

<<- operator, removing tab characters: 27.16. Here Documents

<<- operator, removing TABs with: 28.13. Here Document Example #1: Unformatted Form Letters

<< (here document) operator: 27.16. Here Documents

28.13. Here Document Example #1: Unformatted Form Letters

< >, enclosing event names: 6.4. X Event Translations

<-> filename wildcard: 33.2. Filename Wildcards in a Nutshell

< > regular expression metacharacters: 32.12. Regular Expressions: Matching Words with < and >

32.20. Valid Metacharacters for Different Unix Programs

<=> (comparison) operator in Perl: 41.5.1. Scalars

{ } (braces)

{ } regular expression metacharacters: 32.11. Regular Expressions: Matching a Specific Number of Sets with { and }

32.20. Valid Metacharacters for Different Unix Programs

awk procedures, enclosing: 20.10.2.1. Patterns

dereferencing, use in: 41.5.4. References

filename wildcards: 33.2. Filename Wildcards in a Nutshell

find command: 9.9. Running Commands on What You Find

9.17. Duplicating a Directory Tree

GNU find command and: 9.9. Running Commands on What You Find

in shells: 1.13. Wildcards

33.3. Who Handles Wildcards?

pattern-expansion characters

building strings with: 28.4. Build Strings with { }

for loop, using with: 28.9.2. A for Loop

foreach loop, using with: 28.9.1. A foreach Loop

quoting alias argument in: 29.3. C-Shell Aliases with Command-Line Arguments

sed commands enclosed in: 34.20. Making Edits Everywhere Except...

shell functions, using in: 29.11.2. Functions with Loops: Internet Lookup

variable values, interpolating: 35.3. What Environment Variables Are Good For

[ ] (brackets)

[^ ] filename wildcard: 33.2. Filename Wildcards in a Nutshell

[ command: 35.26. test: Testing Files and Strings

numeric tests, syntax errors: 37.3. Stop Syntax Errors in Numeric Tests

string text syntax errors: 37.4. Stop Syntax Errors in String Tests

bash shell prompts, nonprinting characters: 4.10. Highlighting and Color in Shell Prompts

range operator: 21.11. Hacking on Characters with tr

references to lists in Perl: 41.5.4. References

regular expression metacharacters: 32.20. Valid Metacharacters for Different Unix Programs

^ (caret) within: 32.9. Regular Expressions: Exceptions in a Character Set

character classes: 41.7. Perl Boot Camp, Part 4: Pattern Matching

range, specifying: 32.8. Regular Expressions: Specifying a Range of Characters with [...]

wildcards: 28.3. Use Wildcards to Create Files?

33.2. Filename Wildcards in a Nutshell

fast find commands, using with: 9.19. Wildcards with "Fast find" Database

- (dash)

- numerical subtraction operator: 41.5.1. Scalars

-> (dereferencing) operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

41.5.4. References

command-line arguments starting with: 35.21. Handling Command-Line Arguments with a for Loop

35.22. Handling Arguments with while and shift

35.24. Standard Command-Line Parsing

double dashes, converting to em-dashes in sed: 34.20. Making Edits Everywhere Except...

filenames starting with: 14.13. Handling a Filename Starting with a Dash (-)

subtraction arithmetic operator: 36.21.1. Syntax

with << operator: 27.16. Here Documents

( ) (parentheses)

escaped-parenthesis operators in sed: 34.11. Referencing Portions of a Search String

36.23.4. Using sed

find command operator: 9.1. How to Use find

regular expression metacharacters: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1

32.20. Valid Metacharacters for Different Unix Programs

commands printed in by ps: 24.8. Why ps Prints Some Commands in Parentheses

grouping operator: 13.5. grepping for a List of Patterns

combining commands with: 43.7. The ( ) Subshell Operators

extended regular expressions: 32.15. Extended Regular Expressions

Perl regular expressions: 41.7. Perl Boot Camp, Part 4: Pattern Matching

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

nesting regular expressions in: 13.4. Extended Searching for Text with egrep

operator precedence, overriding with: 32.3. Understanding Expressions

Perl operators, resolving ambiguity in: 41.5.1. Scalars

subshell operator: 3.3. Shell Setup Files — Which, Where, and Why

43.9. How to tee Several Commands into One Place

& (ampersand)

&| background operator, Z shell: 23.11. Disowning Processes

& (logical AND) operator: 36.21.1. Syntax

&& (Boolean AND) operator: 10.13. Copying Directory Trees with tar and Pipes

20.10.2.1. Patterns

28.16. Separating Commands with Semicolons

30.10. Running a Series of Commands on a File

35.14. Testing Your Success

41.3. Compiling Perl from Scratch

41.5.1. Scalars

* (asterisk)

** filename wildcard (zsh): 33.2. Filename Wildcards in a Nutshell

arithmetic operator (multiplication): 36.21.1. Syntax

executable files, denoting in ls -F listings: 8.10. Useful ls Aliases

filename wildcard: 33.2. Filename Wildcards in a Nutshell

33.2. Filename Wildcards in a Nutshell

multiplication operator: 41.5.1. Scalars

regular expression metacharacter: 32.3. Understanding Expressions

32.4. Using Metacharacters in Regular Expressions

quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching

repeating character sets with: 32.10. Regular Expressions: Repeating Character Sets with *

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

shell metacharacter: 32.3. Understanding Expressions

wildcard character: 1.13. Wildcards

9.19. Wildcards with "Fast find" Database

@ (at sign)

@ARGV array: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

csh built-in operator: 28.4. Build Strings with { }

filename wildcard: 33.2. Filename Wildcards in a Nutshell

files as symbolic links, in ls -F listings: 8.10. Useful ls Aliases

for array names: 41.5.2. Arrays

in Perl array values: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

@INC array: 41.2. Checking your Perl Installation

41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

kill character: 5.8. Setting Your Erase, Kill, and Interrupt Characters

` (backquotes)

\`\`, nested command substitution: 36.24. Nested Command Substitution

arguments, reading: 28.17. Dealing with Too Many Arguments

capturing command output in an array: 41.7. Perl Boot Camp, Part 4: Pattern Matching

command substitution operators: 5.3. Setting the Terminal Type When You Log In

8.17. Picking a Unique Filename Automatically

28.14. Command Substitution

excluding files from deletion: 14.18. Removing Every File but One

getopt, using with: 35.24. Standard Command-Line Parsing

nesting: 28.14. Command Substitution

command substitution with: 9.2. Delving Through a Deep Directory Tree

expr command, running with: 36.22. Testing Characters in a String with expr

for loops combined with: 36.11. Standard Input to a for Loop

quoting in Bourne shell: 27.12.2. How Quoting Works

redirecting standard output: 36.16. n>&m: Swap Standard Output and Standard Error

\ (backslash)

\ ( \ ) regular expression metacharacters: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1

32.20. Valid Metacharacters for Different Unix Programs

\1, \2, ... metacharacters, recalling remembered patterns: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1

\ { \ } regular expression metacharacters: 32.11. Regular Expressions: Matching a Specific Number of Sets with { and }

32.20. Valid Metacharacters for Different Unix Programs

\! operator (C shell): 29.3. C-Shell Aliases with Command-Line Arguments

29.4. Setting and Unsetting Bourne-Type Aliases

in alias quoting: 29.3. C-Shell Aliases with Command-Line Arguments

escaping regular expression delimiters in sed: 34.8. Delimiting a Regular Expression

escaping regular expression metacharacters: 32.5. Regular Expressions: The Anchor Characters ^ and $

extended regular expressions and: 32.15. Extended Regular Expressions

in X Window System resource definitions: 6.3. X Resource Syntax

multiline pipes in C shell scripts: 35.19. Shell Script "Wrappers" for awk, sed, etc.

multiple-line statements in Python: 42.3.1. Indentation

before newline, shell quoting and: 27.12.4. Multiline Quoting

27.13.2. How Quoting Works

Perl variables, preventing interpolation in: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

in prompt settings: 4.15. External Commands Send Signals to Set Variables

quoting newlines in sed: 34.24. sed Newlines, Quoting, and Backslashes in a Shell Script

regular expression metacharacters

\< \> matching words with: 32.12. Regular Expressions: Matching Words with < and >

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

in shell quoting: 27.12. Bourne Shell Quoting

Bourne shell: 27.12.2. How Quoting Works

C shell: 27.13. Differences Between Bourne and C Shell Quoting

shell, terminal and program quoting, conflicts in: 27.18. How Many Backslashes?

\ (backspace), stripping from formatted manpages: 2.4. Searching Online Manual Pages

^ (caret)

[^ ] filename wildcard: 33.2. Filename Wildcards in a Nutshell

^[ (ESC character): 8.6.1. Trying It

^ ^ sequence in history substitution: 30.5. My Favorite Is ^^

beginning of line anchor in regular expressions: 32.4. Using Metacharacters in Regular Expressions

32.5. Regular Expressions: The Anchor Characters ^ and $

beginning of line indicator in various utilities: 32.5. Regular Expressions: The Anchor Characters ^ and $

filename wildcard: 33.2. Filename Wildcards in a Nutshell

in control keys: 5.8. Setting Your Erase, Kill, and Interrupt Characters

regular expression metacharacter

matching at beginning of line (Perl): 41.7. Perl Boot Camp, Part 4: Pattern Matching

matching newline at the beginning of a multiline pattern space: 34.16. Making Edits Across Line Boundaries

negating character classes with: 32.18. Limiting the Extent of a Match

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

within [ ] metacharacters: 32.9. Regular Expressions: Exceptions in a Character Set

^xy^yx, shorthand substitution command: 30.8. History Substitutions

: (colon)

between item=attribute values: 8.6.2. Configuring It

Bourne shell operator: 36.6. The Unappreciated Bourne Shell ":" Operator

parameter substitution, use in: 36.7. Parameter Substitution

command in vi: 17.2. What We Cover

17.30. Setting Up vi with the .exrc File

in command-line options: 35.24. Standard Command-Line Parsing

ex commands, issuing from vi: 20.4. Useful ex Commands

logical operator: 36.21.1. Syntax

36.21.2. Examples

as null character: 35.13. Test Exit Status with the if Statement

:p operator, printing command without executing it: 30.11. Check Your History First with :p

separating fields: 1.7. Which Shell Am I Running?

5.6. Checklist: Terminal Hangs When I Log In

separating terminal type values: 5.3. Setting the Terminal Type When You Log In

shell script comments: 36.2. The Story of : # #!

string editing operators: 28.5. String Editing (Colon) Operators

translation table, event and action mappings: 6.4. X Event Translations

, (comma) in filenames: 1.11. Filenames

$ (dollar sign)

$( ) command substitution operator: 28.14. Command Substitution

36.24. Nested Command Substitution

$1, $2, etc., command-line arguments in: 29.11.3. Setting Current Shell Environment: The work Function

$- variable, displaying current flags: 3.4.2. Interactive Shells

$* argument: 36.23.1. Matching with expr

37.5. Quoting and Command-Line Parameters

$# command-line argument: 35.20.3. Counting Arguments with $#

$1 command-line arguments: 35.16. Set Exit Status of a Shell (Script)

35.20. Handling Command-Line Arguments in Shell Scripts

$0 parameter, script names in: 35.28. Finding a Program Name and Giving Your Program Multiple Names

$_ variables in Perl: 41.5.1. Scalars

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

in bash shell prompt: 1.7. Which Shell Am I Running?

4.3. Dynamic Prompts

inside double quotes in C shell quoting: 27.13.2. How Quoting Works

end of line anchor in regular expressions: 32.5. Regular Expressions: The Anchor Characters ^ and $

end of line indicator in various utilities: 8.11. Can't Access a File? Look for Spaces in the Name

32.5. Regular Expressions: The Anchor Characters ^ and $

$Id $ in RCS files: 39.5. RCS Basics

metacharacter in regular expressions and shells: 27.17. "Special" Characters and Operators

quoting in Bourne shell: 27.12.2. How Quoting Works

regular expression metacharacter

matching at end of line (Perl): 41.7. Perl Boot Camp, Part 4: Pattern Matching

matching newline at the end of multiline pattern space: 34.16. Making Edits Across Line Boundaries

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

sed addressing symbol: 34.5. sed Addressing Basics

value of Bourne shell exit status variable (?), getting: 35.12. Exit Status of Unix Processes

variable names, preceding: 35.3. What Environment Variables Are Good For

35.9. Shell Variables

41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

as wildcard: 35.11. Pattern Matching in case Statements

. (dot)

. and .. in directories: 10.2. What's Really in a Directory?

10.4.2. Links to a Directory

. and .. in pathnames: 1.16. Making Pathnames

. command, reading files with: 35.29. Reading Files with the . and source Commands

./ (dot slash), filenames beginning with: 14.13. Handling a Filename Starting with a Dash (-)

.. (integer-range) operator in zsh: 28.4. Build Strings with { }

. (string concatenation) operator: 41.5.1. Scalars

in filenames: 1.11. Filenames

1.13. Wildcards

filenames beginning with: 14.16. Problems Deleting Directories

ls command and: 8.9. Showing Hidden Files with ls -A and -a

wildcards and: 33.2. Filename Wildcards in a Nutshell

regular expression metacharacter: 32.3. Understanding Expressions

matching any character (except newline) in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching

matching any character with: 32.7. Regular Expressions: Match Any Character with . (Dot)

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

relative pathname for current directory: 31.3. What Good Is a Current Directory?

repeat command in vi editor: 17.7. Get Back What You Deleted with Numbered Buffers

= (equal sign)

== (numeric equality) operator: 41.5.1. Scalars

=~ (pattern binding) operator: 41.7. Perl Boot Camp, Part 4: Pattern Matching

== (relational) operator: 20.10.7. Alphabetical Summary of Commands

in alias definitions: 29.4. Setting and Unsetting Bourne-Type Aliases

29.6. zsh Aliases

assignment operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

=> (fat comma) operator in Perl: 41.5.3. Hashes

relational operator: 36.21.1. Syntax

36.21.2. Examples

socket files: 8.10. Useful ls Aliases

! (exclamation point)

[! ] filename wildcards: 33.2. Filename Wildcards in a Nutshell

! (Boolean NOT) operator: 20.10.2.1. Patterns

! (logical negation) operator: 9.1. How to Use find

41.5.1. Scalars

with find command: 9.8. Exact File-Time Comparisons

!= (not equal) operator: 20.10.7. Alphabetical Summary of Commands

36.21.1. Syntax

41.5.1. Scalars

!~ (pattern-matching) operator: 20.10.7. Alphabetical Summary of Commands

!$, specifying last argument on previous line: 32.5. Regular Expressions: The Anchor Characters ^ and $

in C shell quoting: 27.13.2. How Quoting Works

command line exit status, reversing in bash and zsh: 35.12. Exit Status of Unix Processes

filename wildcard: 33.2. Filename Wildcards in a Nutshell

filtering vi text through Unix command: 17.18. Filtering Text Through a Unix Command

find command operator: 13.3. Finding Text That Doesn't Match

history substitution commands: 30.8. History Substitutions

!! and !: sequences: 30.8. History Substitutions

!$ notation: 29.3. C-Shell Aliases with Command-Line Arguments

!$ sequence: 30.3. My Favorite Is !$

30.6. Using !$ for Safety with Wildcards

30.8. History Substitutions

bash shell quoting and: 27.12.1. Special Characters

!:n* sequence: 30.4. My Favorite Is !:n*

regular expression metacharacter

sed editor replacements: 34.20. Making Edits Everywhere Except...

sed address followed by: 34.5. sed Addressing Basics

test command using: 35.26. test: Testing Files and Strings

in X Window System comments: 6.3. X Resource Syntax

# (hash mark)

# and ## filename wildcards: 33.2. Filename Wildcards in a Nutshell

: (colon) used in place of: 36.6. The Unappreciated Bourne Shell ":" Operator

#! notation: 27.3.6. Default Commands

36.2. The Story of : # #!

in Bourne shell scripts: 35.1. Writing a Simple Shell Program

in Perl scripts: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

in comments: 36.2. The Story of : # #!

# $Id $, commenting RCS files in a shell or Perl script: 39.5. RCS Basics

dynamic prompts in tcsh and zsh shells: 4.3. Dynamic Prompts

erase character: 5.8. Setting Your Erase, Kill, and Interrupt Characters

in crontab entries: 25.2.1. Execution Scheduling

shell prompt for zsh shells: 27.12.2. How Quoting Works

vi editor, alternate filename: 17.3. Editing Multiple Files with vi

% (percent sign)

%?, prefixing job numbers: 23.3. Using jobs Effectively

arithmetic operator (modulus): 36.21.1. Syntax

formatting operator in Python: 42.3.5. I/O and Formatting

in shell prompts

%{ and %} delimiters for nonprinting escape sequences: 4.10. Highlighting and Color in Shell Prompts

%# (dynamic prompt), tcsh and zsh shells: 4.3. Dynamic Prompts

%! for zsh hisotry number: 4.3. Dynamic Prompts

C (csh) shell: 1.7. Which Shell Am I Running?

vi editor, current filename: 17.3. Editing Multiple Files with vi

+ (plus sign)

++ (autoincrement) operator: 41.5.1. Scalars

+ operator (one or more): 13.3. Finding Text That Doesn't Match

addition (arithmetic) operator: 32.3. Understanding Expressions

36.21.1. Syntax

41.5.1. Scalars

data command option: 8.17. Picking a Unique Filename Automatically

filename wildcard: 33.2. Filename Wildcards in a Nutshell

in job numbers: 23.3. Using jobs Effectively

regular expression metacharacter: 13.4. Extended Searching for Text with egrep

32.15. Extended Regular Expressions

32.20. Valid Metacharacters for Different Unix Programs

quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching

? (question mark)

?*) wildcard metacharacters in case statements: 35.11. Pattern Matching in case Statements

Bourne shell variable for command exit status: 35.12. Exit Status of Unix Processes

filename wildcard: 33.2. Filename Wildcards in a Nutshell

33.2. Filename Wildcards in a Nutshell

nonprinting characters, converting to with ls -q: 8.12. Showing Nonprintable Characters in Filenames

regular expression metacharacter: 13.4. Extended Searching for Text with egrep

32.15. Extended Regular Expressions

quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

as secondary shell prompt: 28.9.1. A foreach Loop

shell wildcard, matching with fast find commands: 9.19. Wildcards with "Fast find" Database

wildcard character: 1.13. Wildcards

" (quotes, double)

$ and ' inside, in C shell quoting: 27.13.2. How Quoting Works

around filenames, renaming files and: 10.9. Renaming, Copying, or Comparing a Set of Files

converting straight quotes to curly quotes with sed: 34.20. Making Edits Everywhere Except...

for comments in vi .exrc file: 17.30. Setting Up vi with the .exrc File

in command arguments: 1.4. Communication with Unix

in prompts: 4.2. Static Prompts

4.6. Faster Prompt Setting with Built-ins

4.7. Multiline Shell Prompts

4.10. Highlighting and Color in Shell Prompts

in regular expressions: 13.4. Extended Searching for Text with egrep

in sed scripts: 37.8. Cleaning script Files

in shell quoting: 27.12. Bourne Shell Quoting

27.12.2. How Quoting Works

27.13. Differences Between Bourne and C Shell Quoting

ls -Q command output: 8.11. Can't Access a File? Look for Spaces in the Name

passing wildcards to programs: 33.3. Who Handles Wildcards?

search patterns in csplit program: 21.10. Splitting Files by Context: csplit

shell arrays, expanded values: 9.23.2. Expanding Ranges

variable interpolation in Perl: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

wildcard pattern matching in case statements: 35.11. Pattern Matching in case Statements

' (quotes, single)

; (semicolon), using with in C shell: 9.9. Running Commands on What You Find

around filenames, renaming files and: 10.9. Renaming, Copying, or Comparing a Set of Files

in alias quoting: 29.3. C-Shell Aliases with Command-Line Arguments

29.4. Setting and Unsetting Bourne-Type Aliases

in bash pre-prompt commands: 4.16. Preprompt, Pre-execution, and Periodic Commands

in prompts: 4.2. Static Prompts

4.7. Multiline Shell Prompts

4.10. Highlighting and Color in Shell Prompts

in shell quoting: 27.12. Bourne Shell Quoting

27.12.2. How Quoting Works

27.13. Differences Between Bourne and C Shell Quoting

inside double quotes (C shell): 27.13.2. How Quoting Works

passing wildcards to programs: 33.3. Who Handles Wildcards?

regular expressions, quoting: 32.2. Don't Confuse Regular Expressions with Wildcards

strings in case statements: 35.11. Pattern Matching in case Statements

; (semicolon)

code separator in color escape sequences: 8.6.1. Trying It

separating awk procedures: 20.10.2.1. Patterns

separating commands: 28.16. Separating Commands with Semicolons

35.17. Trapping Exits Caused by Interrupts

in case statements: 35.10. Test String Values with Bourne-Shell case

find -exec and: 9.9. Running Commands on What You Find

in shell functions: 29.11.1. Simple Functions: ls with Options

/ (slash)

/* $Id $ */, commenting C program RCS files: 39.5. RCS Basics

/*/* wildcard metacharacters in case statements: 35.11. Pattern Matching in case Statements

arithmetic operator (division): 36.21.1. Syntax

arithmetic opertor (division): 41.5.1. Scalars

Bourne-type shells, quoting and: 27.12.1. Special Characters

delimiter for regular expressions in sed: 34.8. Delimiting a Regular Expression

directory, denoting in ls -F listings: 8.10. Useful ls Aliases

in filenames: 1.11. Filenames

1.13. Wildcards

in pathnames: 1.16. Making Pathnames

31.2. Using Relative and Absolute Pathnames

absolute pathnames: 1.9. Internal and External Commands

tar archives and: 38.6.1. Restoring a Few Files

wildcard matching across: 38.10.2. With GNU tar

search patterns in vi editor, delimiting: 17.8. Using Search Patterns and Global Commands

shell, treatment of: 9.19. Wildcards with "Fast find" Database

~ (tilde)

~ and !~ (pattern-matching) operators: 20.10.7. Alphabetical Summary of Commands

abbreviation for any directory: 29.5. Korn-Shell Aliases

filenames ending with: 31.11. Finding (Anyone's) Home Directory, Quickly

Emacs backup files: 1.12. Filename Extensions

8.7. Some GNU ls Features

for home directory: 3.7. Use Absolute Pathnames in Shell Setup Files

7.2. Many Homes

31.11. Finding (Anyone's) Home Directory, Quickly

in pathnames: 1.16. Making Pathnames

_ (underscore)

ASCII class for: 5.14. Defining What Makes Up a Word for Selection Purposes

in filenames: 1.11. Filenames

| (vertical bar)

|| (Boolean OR) operator: 20.10.2.1. Patterns

28.16. Separating Commands with Semicolons

35.13. Test Exit Status with the if Statement

41.5.1. Scalars

testing scripts with: 35.14. Testing Your Success

alternation operator: 13.4. Extended Searching for Text with egrep

13.5. grepping for a List of Patterns

41.7. Perl Boot Camp, Part 4: Pattern Matching

|& operator: 43.5. Redirection in C Shell: Capture Errors, Too?

bitwise or operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy

command separator in ex editor: 17.14. Useful Global Commands (with Pattern Matches)

filename wildcard: 33.2. Filename Wildcards in a Nutshell

files, named pipe (FIFO): 8.10. Useful ls Aliases

logical OR operator: 36.21.1. Syntax

noclobber variable and: 43.6. Safe I/O Redirection with noclobber

pipes: 1.5. Programs Are Designed to Work Together

redirecting standard output: 36.16. n>&m: Swap Standard Output and Standard Error

36.16. n>&m: Swap Standard Output and Standard Error

regular expression metacharacter

alternation in pattern matching: 32.15. Extended Regular Expressions

use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs

separating multiple ex editor commands: 18.6. Protecting Keys from Interpretation by ex

wildcard metacharacter in case statements: 35.11. Pattern Matching in case Statements

Numbers

:0 (zero) operator, in history substitutions: 30.8. History Substitutions

0 (zero) process ID: 24.14. Killing All Your Processes

-1 process ID: 24.14. Killing All Your Processes

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