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Index: Symbols and Numbers

>>> as leading characters : sendmail, 4.2. Verbose (-v)

nested

sendmail, 10.4. Nested Angle Brackets
sendmail, 17.1.1.2. Strip to left of <

null address : (see addresses, null)

'' (apostrophes) (expect nothing) : TCP/IP Network Administration, 6.3.3. chat

* (asterisk)

in mail queue listing

sendmail, 4.1.2. Show Queue Mode (-bp)
sendmail, 23.4. Printing the Queue

meaning interface not enabled : TCP/IP Network Administration, 6.1.1. Determining the Interface Name

in name field, indicating wildcard character : TCP/IP Network Administration, C.3.1. Standard Resource Records

@ (at sign)

in addresses

sendmail, 17.1.1.3. Handle null address
sendmail, 29.4.5. Focusing for @ Syntax

chacl command with : Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists

for current origin : TCP/IP Network Administration, C.3.1. Standard Resource Records

excluding an individual parameter : TCP/IP Network Administration, 9.4. A BOOTP Server

referencing current domain : TCP/IP Network Administration, 8.3.5. The Reverse Domain File

in xhost list : Practical UNIX & Internet Security, 17.3.21.3. The xhost facility

@ flag : sendmail, 30.8. Alphabetized F= Flags

\ (backslash)

escaping newline characters

TCP/IP Network Administration, 9.2.1. The printcap File
TCP/IP Network Administration, A.3. chat
TCP/IP Network Administration, C.3.1. Standard Resource Records

in header fields : sendmail, 35.3.2. Escape Character in the Header Field

mail command and : Practical UNIX & Internet Security, 15.1.3. mail Command

in rules : sendmail, 28.1.2.1. Backslashes in rules

in UUCP addresses

sendmail, 17.1.4. UUCP Addresses
sendmail, 19.6. Alphabetized m4 Macros

! (bang) and mail command : Practical UNIX & Internet Security, 15.1.3. mail Command

: (colon)

in addresses

sendmail, 17.1.2.1. A rule to handle List:;
sendmail, 34.8. Alphabetized Reference

beginning and ending fields

TCP/IP Network Administration, 9.2.1. The printcap File
TCP/IP Network Administration, 9.2.2. Solaris Line Printer Service

separating parameters : TCP/IP Network Administration, 9.4. A BOOTP Server

: flag : sendmail, 30.8. Alphabetized F= Flags

{} (curly braces)

sendmail, 5.3.2. Macros

sendmail, 5.3.5. Class Macros

sendmail, 7.1. Overview

configuration statements

TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, B.2. The gated Configuration Language
TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File

long variable names : TCP/IP Network Administration, 10.5. sendmail Configuration

macro names : TCP/IP Network Administration, 10.5.2. The Define Macro Command

$ (dollar sign)

$ line (qf file) : sendmail, 23.9. The qf File Internals

$ rule-testing command : sendmail, 38.3.1. Dump a Defined Macro with $

in macro names : sendmail, 31.5. Macro Expansion: $ and $&

wildcard operators

sendmail, 8.7. Wildcard Operators
(see also wildcard operators)

$1, $2, ... : (see positional operators)

$&

sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
sendmail, 31.5.3. Use Value as Is with $&

$> : sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set

$* : sendmail, 10.2.1. The LHS

$@

sendmail, 9.2.2. The Host ($@)
sendmail, 9.3. Testing Rule Set 0
sendmail, 11.4.1. Rewrite the Lone Username
sendmail, 17.1.1.3. Handle null address
sendmail, 28.6.3. Rewrite-and-Return Prefix: $@
sendmail, 30.5.2.1. The $@ dsn part
sendmail, 33.4.2. Specify Numbered Substitution with $@

$[ and $]

sendmail, 19.6. Alphabetized m4 Macros
sendmail, 21.2.4. The $[ and $] Operators
sendmail, 28.6.6. Canonicalize Hostname: $[ and $]
sendmail, 33.4.3. $[ and $]: A Special Case

$:

sendmail, 9.2.3. The User ($:)
sendmail, 9.3. Testing Rule Set 0
sendmail, 28.6.2. Rewrite Once Prefix: $:
sendmail, 29.6.1. Further Processing: $:user
sendmail, 30.5.3. The $: Part
sendmail, 33.4.1. Specify a Default with $:
sendmail, 33.4. Use Maps with $( and $) in Rules

$.

sendmail, 14.1.3. Testing So Far
sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$=

sendmail, 12.1. The Class Command
sendmail, 32.2.1. Matching Any in a Class: $=
sendmail, 38.3.2. Dump a Class Macro with $=

$#

sendmail, 9.2.1. The Delivery Agent ($#)
sendmail, 28.6.5. Specify a Delivery Agent: $#

$- : sendmail, 11.4.1. Rewrite the Lone Username

$( and $) : sendmail, 33.4. Use Maps with $( and $) in Rules

$+ : sendmail, 8.7. Wildcard Operators

$?

sendmail, 14.1.3. Testing So Far
sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$~ : sendmail, 32.2.2. Matching Any Not in a Class: $~

$| : sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$_ macro

sendmail, 20.2.4. Verify identd Information
sendmail, 23.9. The qf File Internals
sendmail, 26.1.3.9. relay= the host that sent or accepted the message
sendmail, 31.10. Alphabetized Reference

. (dot)

. line (qf file) : sendmail, 23.9. The qf File Internals

checking for in ${pd} : sendmail, D.1. Sun Enhancements

for current directory : Practical UNIX & Internet Security, 5.1.1. Directories

to end messages

sendmail, 4.2. Verbose (-v)
sendmail, 30.8. Alphabetized F= Flags

filenames starting with, disabling creation of : Building Internet Firewalls, 8.2.1.6. Be careful of writable

host status file line : sendmail, B.1. Status file lines

leading in messages : sendmail, 34.8. Alphabetized Reference

trailing in FQDNs

sendmail, 15.3. MX Records
sendmail, 17.4. Rule Set 4
sendmail, 29.5.1. Stripping Trailing Dots

.. directory : Practical UNIX & Internet Security, 5.1.1. Directories

.. for domain name : TCP/IP Network Administration, C.3.1. Standard Resource Records

! (exclamation point) and mail command : Practical UNIX & Internet Security, 15.1.3. mail Command

# (hash mark; sharp sign) : Practical UNIX & Internet Security, 6.5.1. Message Digests

for comments

sendmail, 5.1. Overview
sendmail, 5.2.2. Comments
sendmail, 27.2. Comments
sendmail, 38.2. Configuration Lines
TCP/IP Network Administration, 3.2. The Host Table
TCP/IP Network Administration, 5.4. The Internet Daemon
TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, 9.1.4. NFS Automounter
TCP/IP Network Administration, 9.2.1. The printcap File
TCP/IP Network Administration, 9.4. A BOOTP Server
TCP/IP Network Administration, A.1.1. The dip Script File
TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File

disabling services with : Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services

in :include: lists : sendmail, 25.2.1. Comments in :include: Lists

lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem

in m4 files : sendmail, 19.5. Pitfalls

- (hyphen)

in machine conversation : sendmail, 4.2. Verbose (-v)
non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands

-> (arrow), for copying files : TCP/IP Network Administration, 9.6.1. rdist

() (parentheses), for continuation characters : TCP/IP Network Administration, C.3.1. Standard Resource Records

% in addresses

sendmail, 17.1.5. The % Hack
sendmail, 21.5.1. Offsite MX Hosts

+ (plus sign)

in configuration file : sendmail, 1.3.1. The Configuration File

indicating a trusted host : TCP/IP Network Administration, 12.2.5. Secure the r Commands

in hosts.equiv file : Practical UNIX & Internet Security, 17.3.18.5. Searching for .rhosts files

marking users with : sendmail, 24.4.3. Plussed Users

in NIS

Practical UNIX & Internet Security, 19.4. Sun's Network Information Service (NIS)
Practical UNIX & Internet Security, 19.4.4.6. NIS is confused about "+"

? for delivery agent flags

sendmail, 14.2. Headers Versus Delivery Agent Flags
sendmail, 35.4. ?flags? in Header Definitions

" (quotation marks)

sendmail, 13.2.8. The Unquoted Space Replacement Character

sendmail, 19.1.1. m4 is greedy

sendmail, 31.3.2. Syntax of the Configuration File Macro's Text

dequote database class : sendmail, 33.8. Alphabetized Reference

in header fields : sendmail, 35.3.3. Quoted Strings in the Header Field

stripping from addresses

sendmail, 30.8. Alphabetized F= Flags
sendmail, 33.3.4.9. -q don't strip quotes from key (V8.7 and above)

"" (expect nothing)

TCP/IP Network Administration, 6.3.3. chat
TCP/IP Network Administration, A.3. chat

; (semicolon)

comment character : TCP/IP Network Administration, C.3.1. Standard Resource Records

ending gated configuration statements

TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, B.2. The gated Configuration Language

# (sharp sign; hash mark) : Practical UNIX & Internet Security, 6.5.1. Message Digests

for comments

sendmail, 5.1. Overview
sendmail, 5.2.2. Comments
sendmail, 27.2. Comments
sendmail, 38.2. Configuration Lines
TCP/IP Network Administration, 3.2. The Host Table
TCP/IP Network Administration, 5.4. The Internet Daemon
TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, 9.1.4. NFS Automounter
TCP/IP Network Administration, 9.2.1. The printcap File
TCP/IP Network Administration, 9.4. A BOOTP Server
TCP/IP Network Administration, A.1.1. The dip Script File
TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File

disabling services with : Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services

in :include: lists : sendmail, 25.2.1. Comments in :include: Lists

lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem

in m4 files : sendmail, 19.5. Pitfalls

/ (slash)

/ flag : sendmail, 30.8. Alphabetized F= Flags

character in alias

sendmail, 24.2.2. Delivery to Files
sendmail, 25.7.3. Appending to Files

IFS separator : Practical UNIX & Internet Security, 11.5.1.2. IFS attacks

root directory

Practical UNIX & Internet Security, 5.1.1. Directories
(see also root directory)

~ (tilde)

in automatic backups : Practical UNIX & Internet Security, 18.2.3.5. Beware stray CGI scripts

for home directory

Practical UNIX & Internet Security, 11.5.1.3. $HOME attacks
sendmail, 25.7. The User's ~/.forward File

~! in mail messages : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command

| (vertical bar)

! flag : sendmail, 30.8. Alphabetized F= Flags

| prefix

sendmail, 22.4.3. The F Command - Program Form
sendmail, 24.2.3. Delivery via Programs

in addresses : (see programs, delivering to)

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