August 2003
Intermediate to advanced
816 pages
28h 15m
English
book
Managing Linux® Systems with Webmin™ System Administration and Module Development
by Jamie Cameron
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37.11. Adding Sendmail Features with M4
The primary Sendmail configuration file sendmail.cf is extremely complex, and almost impossible to edit manually. Fortunately, it is usually built from a series of M4 macro files that are much simpler and can be modified using this module or by manual editing. M4, for those who have not heard of it before, is a program that parses text files and expands macros in them. These macros can include other text files, define variables and functions, or exclude text based on certain conditions. M4 is very similar to the preprocessor used by the C programming language which handles #include and #define statements. Fortunately, this module hides most of the complex details from you.
Often, the default Sendmail configuration ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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