Linux man pages are an integral part of Linux folklore. Even seasoned users have to refer to man pages every once in a while. Wouldn't it be much more fun if man pages were a little colorful? If you run a graphical X desktop, it isn't much trouble to add some color to the otherwise very technical and curt manuals. Simply copy the contents of the file called XTerm in the app-defaults directory to your .Xdefaults file. The following replaces the .Xdefaults file entirely:
$ cp /usr/share/X11/app-defaults/XTerm ~/.Xdefaults
Edit the file and uncomment these lines (or create them if they aren't in your particular file). Change the colors from yellow and red to your favorite colors if yellow and red do not suit you:
*VT100*colorULMode: on *VT100*colorUL: yellow !*VT100*italicULMode: on *VT100*underLine: off ! Uncomment this to use color for the bold attribute *VT100*colorBDMode: on *VT100*colorBD: red
Enjoy the colorful man pages!
Firefox is a great browser, but you already knew that, right? Firefox's keywords facility can be used for a neat search trick. It is best used for a directed search engine that digs specific data—for example, a Bugzilla search, IMDb search, LXR search or Marcel/wine search (www.wine-searcher.com), and so on. Here are the steps:
Go to a site that offers a simple search facility (for example, IMDb, LXR or your local Bugzilla).
Place the cursor within the search box.
Right-click, and select Add a Keyword for this Search.
Give your new search shortcut a name.
Give your new search shortcut a short keyword (for example, I use bz for my Bugzilla search and lxr for LXR).
To try out your new keyword search shortcut, open a new tab (Ctrl-T), place the cursor at the location bar (Ctrl-L), type your keyword followed by the search term(s)—for example, assuming you added keyword bz for the search at bugzilla.mozilla.org, then typing bz 95849 in the location bar will show you this: https://bugzilla.mozilla.org/show_bug.cgi?id=95849.
This is an ideal way to use a search engine that digs through some specific data.
You can create a neat logo from the Linux command line:
$ convert -size 800x120 xc:white -font Times-Roman -pointsize 100 -fill gray -annotate +20+80 'Linux is cool!' -fill black -annotate +23+83 'Linux is cool!' -trim +repage logo.png
And, the following command should display the result:
$ qiv logo.png
If you want to play with multiple colors and fonts, the following will help:
$ convert -list type $ convert -list color
Say you have two PCM audio files in WAV format. You can concatenate them with the following command (they must both have the same sample rates, encoding, endianness and so on):
$ sox file1.wav file2.wav combined.wav
If you want to mix two audio tracks, try this:
$ soxmix file1.wav file2.wav mix.wav
Linux Journal pays $100 for tech tips we publish. Send tips and your contact information to firstname.lastname@example.org.
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.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.View Now!
|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- The Firebird Project's Firebird Relational Database
- Stunnel Security for Oracle
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Managing Linux Using Puppet
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Doing for User Space What We Did for Kernel Space
- SuperTuxKart 0.9.2 Released
- Google's SwiftShader Released
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