 | Chapter 31 Defined Macros |  |
| Chapter 31 Defined Macros | |
The various features of the m4 technique use uppercase
single-character macro names. The complete list of them is
shown in
Table 31.5.
Some of these are defined by using the appropriate define
m4 command (see below).
Others are predefined for you by the m4 technique.
See the appropriate section reference for a full description of how to use
each macro.
| Macro | Description | |
|---|---|---|
$B | Section 31.10.5, $B | The BITNET relay |
$C | Section 31.10.9, $C | The hostname of the DECnet relay |
$E | Section 31.10.13, $E | X.400 relay (unused) |
$F | Section 31.10.15, $F | FAX relay |
$H | Section 31.10.18, $H | The mail hub |
$L | Section 31.10.23, $L | Unknown Local User relay |
$M | Section 31.10.25, $M | Who we are masquerading as |
$R | Section 31.10.32, $R | The relay for unqualified names (deprecated) |
$S | Section 31.10.34, $S | The Smart Host |
$U | Section 31.10.37, $U | The UUCP name to override $k |
$V | Section 31.10.39, $V | The UUCP relay (for class $=V) |
$W | Section 31.10.41, $W | The UUCP relay (for class $=W) |
$X | Section 31.10.43, $X | The UUCP relay (for class $=X) |
$Y | Section 31.10.45, $Y | The UUCP relay for unclassified hosts |
$Z | Section 31.10.47, $Z | The version of this m4 configuration |
A few m4 macros can be defined by using the m4 define
command.
For example, here is how you define the BITNET relay with
the BITNET_RELAY keyword:
define(`BITNET_RELAY', `host.domain')dnl
See Table 31.6 for a list of those m4 macros that can be defined. The leftmost column in that table shows the keyword to use.
| m4 name | Macro | Description | |
|---|---|---|---|
| BITNET_RELAY | $B | Section 31.10.5 | The BITNET relay |
| confCF_VERSION | $Z | Section 31.10.47 | The version of this m4 configuration |
| confDOMAIN_NAME | $j | Section 31.10.20 | Official canonical name |
| confMAILER_NAME | $n | Section 31.10.26 | Error message sender |
| FAX_RELAY | $F | Section 31.10.15 | FAX relay |
| LUSER_RELAY | $L | Section 31.10.23 | Local user relay |
| MAIL_HUB | $H | Section 31.10.18 | The mail hub |
|  | |
| 31.7 Categories of Macros |  | 31.9 Pitfalls |