Messages - A Multi-Media Mailer
Everyone wants to do mail their own way—and the same is true with messages. Messages has dozens of options you may set—so many that it provides its own interface to setting and querying these. If you select Set Options on the Other menucard, messages will present a list of the options and their current setting. I'll bet as soon as you have messages working, it won't be long before you will be poring through the options, trying them out.
The designers chose to not keep the messages database compatible with that of other Unix mail readers like elm. In conventional Unix mail user agents (e.g., mail) when mail is received, it is first stored in /usr/spool/mail/$USER as a simple “flat” file. All the mail is mashed together in one physical file. It's up to the mail reader to sort these out. This works fine when the file is small, but when you have 100 pieces of multi-media mail, each 50K in size, it starts getting unwieldy and slow.
Now when you invoke your mail reader (e.g., elm), the reader shows you what is in /usr/spool/mail/$USER. When you save the mail to a folder, the mail is appended to some file in $HOME/Mail (e.g. ~/Mail/tpg in my case). Just as with the mail in /usr/spool/mail, this is also a simple file containing many logical files (pieces of mail). It will suffer even more from performance problems as you keep more and more mail around. Most mail readers allow you to create separate folders for categories of mail—but each still uses one monolithic file.
In the world where AUIS was developed, it is not unusual for one to have hundreds of pieces of mail (and large multi-media mail at that). So another, incompatible approach was taken. Messages keeps each individual piece of mail as a separate file in a folder (i.e., directory) and builds an index so it can quickly show what's in the folder. Each of these folders is kept in the directory $HOME/.MESSAGES.
The drawback to this approach is that you cannot directly switch between elm, for example, and messages. Any mail received by messages is not available in your next elm session. Similarly, mail you received in the past with elm, is not directly available in messages. However, that does not mean it cannot be done—but you must do it “manually”. I have developed some techiques to allow you to “convert” your elm mail for use in messages and vice versa. I will not describe these in detail, but rather direct you to read about it in /usr/andrew/README.ez.mail which is created when you install the auis63L?-mail package.
Just as AUIS prints other text documents, messages will print your mail using PostScript. In this version AUIS objects all generate troff output—along with copious amounts of embedded PostScript. The troff is then processed to generate the necessary PostScript. The default print command will invoke a shell, /usr/andrew/etc/atkprint. The default preview command calls the shell /usr/andrew/etc/atkpreview. Each of these shells will invoke the groff formatter to generate the PostScript output. In atkpreview the groff output is directed into ghostview.
A mailing list is available at firstname.lastname@example.org (mail to email@example.com for subscriptions). The newsgroup comp.soft-sys.andrew is dedicated to the discussion of AUIS. A World Wide Web home page can be found at www.cs.cmu.edu:/afs/cs.cmu.edu/project/atk-ftp/web/andrew-home.html. A book, Multimedia Application Development with the Andrew Toolkit, has been published by Prentice-Hall (ISBN 0-13-036633-1). An excellent tutorial is available from the Consortium by sending mail to firstname.lastname@example.org and asking about the manual, A User's Guide to AUIS.
Terry Gliedt (email@example.com) left Big Blue last year after spending over twenty years with IBM. Although he has worked with Un*x and AUIS for over six years, he is a relative newcomer to Linux. Terry does contract programming, teaches classes in C/C++ and Unix and writes the occasional technical document.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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- My +1 Sword of Productivity
- SUSE LLC's SUSE Manager
- Non-Linux FOSS: Caffeine!
- Managing Linux Using Puppet
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- Parsing an RSS News Feed with a Bash Script
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- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide