Hamming It Up On Linux
In visiting a TNOS system, you will find many things that are familiar. Various core Internet protocols are supported, such as FTP, SMTP, POP, ICMP. Many familiar applications, like finger, can also be found.
You will find things that are new, too. A telnet connection, rather than a login to a shell program, will find you placed in a Packet Bulletin Board System. You will find specialized information servers and other goodies.
And then there are conference bridge applications. These are the amateur radio equivalant of IRC. You could be “chatting” with amateurs around the world.
I said “could” because most Amateur Radio gateways are secured very heavily: partly for the same reasons that you would secure your system on the Internet, and also because Amateur Radio operators have certain laws to which they are held accountable regarding the content of the information transmitted over their radios.
AX.25 support has been added to the Linux kernel, and it is maturing quite well, thanks to the efforts of Alan Cox and several others. As this becomes more and more usable, the large xNOS applications will probably become history, with their unique functions becoming stand-alone daemon programs which will run in the background. Several TNOS-specific features have already been made into stand-alone programs. Additional Internet services will become readily available via Amateur Radio, e.g. Gopher, World Wide Web, NNTP, etc.
So, expect to see increasing numbers of Amateur Radio operators coming to Linux. You can take this as a welcome addition, as they are some of the most innovative and technologically sound individuals to be found. Now, when you read magazine articles that say that both the Internet and wireless technologies are on the increase, maybe you will have a better understanding as to why.
Brian A. Lantz has been a software developer in embedded and multi-user systems for the last 15 years, specializing in device drivers, communications and networking. Aside from being employed by Utility Partners, Inc., in Tampa, FL, he spends most of his idle time hacking on Linux, helping with the local Amateur Radio network and running an amateur radio gateway to the Internet. Sleeping is attended to occasionally. He welcomes your comments, sent to email@example.com.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
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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