At the Forge - Weblogs and Slash
Last month, we looked at the installation and basic administration of Slash, the open-source Weblog and community system that powers the popular Slashdot site, among others. Slash, which is distributed under the GNU Public License, takes advantage of Perl, mod_perl and Apache.
Slash uses the term journals for its Weblogs. Each user on the system can keep his or her own journal; this functionality is available by clicking Journal on the You menu, which typically is displayed along the left side of the screen. This invokes journal.pl, which is located inside of your site's Slash directory. On my computer, named chaim-weizmann, I found journal.pl in /usr/local/slash/site/chaim-weizmann/htdocs/journal.pl. The code is easier to read than I imagined, but even if you are an experienced Perl hacker, you should find that a great many functions are centralized and customized for the Slash environment. That said, changing Slash does not appear to be terribly difficult, if you are interested in tinkering with it.
The first time you click on the Journal link, you see a screen that looks like the screenshot pictured in Figure 1. A message there indicates you have not created any journal entries, and several links offer you the chance to write in your journal or edit existing entries.
Let's create a new journal entry by clicking on the Write in Journal link. This opens a new page, shown in Figure 2. We enter a subject, a topic (a combination of the global list of topics, along with user journal), an indication of whether you want to allow others to comment on your journal entry and the entry itself.
When you have finished writing a journal entry, you can click the Preview button, which allows you to look at your entry before posting it. This seems a bit patronizing to me; although I understand it is useful and important for people to proofread and double-check their work before submitting it, at times I want to move ahead and prefer not to preview my work.
Next to the Preview button is a selection list that allows you to indicate how your journal entry should be formatted. The default, HTML format, allows you to stick HTML tags into your journal, so that you can create <b>boldface</b> and <i>italic</i> text. Of course, HTML does not differentiate between types of whitespace, which means choosing this formatting method requires you to separate paragraphs with <p> tags. It also means you can enter a literal < or > character only by using the appropriate HTML entity, < or &rt;.
The extrans formatting option would have been my preference, if I had known what it was from the beginning: extrans assumes that every character should be taken literally and converts multiple newline characters into HTML paragraph breaks. I realize that the option says “HTML tags to text”, but that seems less important than the fact that paragraph separations are preserved in the final copy.
Once you have previewed your entry at least once, a Save button appears between the Preview button and formatting selection list. You can continue to modify and preview your journal entry, or you can save it and make it viewable by everyone else by clicking on the Add button). Indeed, anyone can view the journal I created on chaim-weizmann by pointing their browsers to the URL chaim-weizmann/~reuven/journal.
As often is the case with other Weblog and journal software, Slash makes it possible and easy to solicit comments from other users. By default, this option is off, and the instructions indicate clearly and repeatedly that turning comments on means they remain on forever.
This option is set for each individual journal entry; some can allow comments and others can forbid them, as users see fit. You can change the default setting by clicking the Edit Preferences link at the top of the journal page and then selecting comments disabled or comments enabled, as appropriate. Because you are setting only a default value, it has no effect on already existing journal entries and comments.
Adding comments to a journal entry that has enabled them is somewhat less than straightforward to the uninitiated. Each journal entry is followed by a menubar (Figure 3), which both controls the display of the discussion and allows users to participate in it. I say that this is confusing because it is easy to miss the Reply button, which allows you to add to the discussion, and the rest of the menubar, which changes the way the discussion is viewed.
Replying actually is slightly more complicated than this. To reply to the original posting, click on the Reply button that immediately follows the article. But, if you want to reply to a comment, thus creating a threaded discussion, you instead click on Reply to This link, which appears immediately beneath each comment. This structure makes logical sense, but I must admit that even after years of following and participating in discussions on Slash-powered sites, it took me some time to find and understand the distinction between the two methods.
Interface aside, adding a comment is identical to adding a new posting, except you cannot restrict people from commenting on what you have written. Enter a subject and the text of the comment, indicate the formatting and then either preview or add your comment. Slash allows you to post comments as an anonymous user, known as Anonymous Coward, by checking the post anonymously box next to the entry. However, many administrators have configured their systems to forbid such anonymous postings on the assumption that anonymity reduces accountability.
Finally, the display settings make it possible to view a discussion in any of several ways. The threshold setting allows you to selectively view comments, based on scores assigned by other members of the site's community. Moderation and the related meta-moderation feature can be activated by the site's administrator, and they allow community members to determine which comments deserve the most attention.
The display setting changes the way in which threaded discussions are shown. I always have preferred to see such discussions in nested format, meaning that responses always are visible, indented somewhat from their parent. By default, Slash sites show the comments in threaded mode, which requires that you explicitly ask to view a comment before it is visible.
Finally, you can ask to see the comments in various orders. Journal entries always are displayed, Weblog-style, starting with the newest entry and ending with the oldest one. Comments to these journal articles, by contrast, normally are displayed in chronological order, with the oldest comment at the top. Therefore, keeping up with a discussion over time requires scrolling down to the bottom of the screen.
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.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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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