Best of Technical Support
What are the .plan and .project files read by the finger command and what should they contain? —Chris MasonSlackware 2.0.29
In the good old days before the Web, there were no home pages. Instead, if I wanted to find out more about someone, I would “finger” them. The finger command asks the server to display information about a user, including the contents of the user's .plan and .project files. You can put any information you wish in these files: your name, e-mail address, fax and phone numbers or favorite sayings.
Note that many system administrators consider the finger command to be a potential security risk and have turned it off, so don't be surprised if you “finger” someone and receive a message along the lines of “access denied”. Also, many implementations of finger read only the .plan file. —Vince Waldon email@example.com
I have a PC with an Intel Pentium 150. Will Linux run on it? I've heard it runs on a 386 or a 486 but has trouble with certain IBMs—I'm not sure which ones. —Noah Roberts
You should have no problem running Linux on the machine you describe. Early versions of the Linux kernel were unable to support true IBM machines that used the microchannel architecture or MCA (the PS\2 line). That's probably the IBM computer referred to. —Vince Waldon firstname.lastname@example.org
My hard drive spins up and spins down constantly. There is a kernel patch called no_idle on Sunsite [http://sunsite.unc.edu/] to fix this problem, but when I attempt to apply the patch I get a reject file. It seems that the Makefile for the disk drivers has now been created, and as a result, the patch does not apply correctly. I am running 2.0.0. I would like to know if there is something else I could do to stop the spinning. I would appreciate any help. —John BarnitzSlackware 3.1
Most likely you need to find the hdparm package and use it to set the spin down times. I know it can do this for IDE drives. If it's not part of your distribution, you can find it on Sunsite. —Donnie Barnes, Red Hat Software email@example.com
Are there any drivers that provide SCSI support on the motherboard? —Ryan Red Hat 4.1
That depends on the type of SCSI you wish to use. You can check the hardware compatibility lists at http://www.redhat.com/. —Donnie Barnes, Red Hat Software firstname.lastname@example.org
After installing Linux, I noticed I am missing an option available in MS Windows: the US-International keyboard layout. This layout lets anyone with a US keyboard type the special punctuation needed for foreign languages. I live in Puerto Rico, and most, if not all, keyboards sold here are US versions. Since I write mostly in Spanish, I am interested in learning how to make a keymap that emulates Windows' US-International layout. Is there any information about the subject or any already-made keymap file that fits the job? —Carlos M. Fernandez Red Hat 4.1
There may indeed be a keyboard mapping that fits your keyboard. If not, you will have to take one that is close to your desired arrangement and modify it.
You should obtain the kbd package from ftp://sunsite.unc.edu/pub/Linux/system/keyboards/kbd-0.98.tar.gz. It contains tools, documentation and examples that will assist you in your remapping project. It also contains a file called kbd.FAQ, which contains answers to frequently asked questions about the operation of the keyboard under Linux. —Chad Robinson, BRT Technical Services Corporation email@example.com
I have a problem with hackers and one security hole is the command su. I have several users on my system. While I don't want to eliminate the capability of these users to change to other IDs, I do want to eliminate the capability to use su to change to root for all except one or two users. Is this possible? —Are Tysl Slackware 3.1
You may be missing a handy program called sudo, which you can obtain from your nearest Sunsite mirror. This program allows you to configure su actions for each user based on who the user is and what you wish him to be able to access.
If that does not meet your goal, why not fall back to the standard Unix security functions? Create a new group called su. Change the group on /bin/su from bin to su. The permissions are most likely 4755 (-rwsr-xr-x), which means anybody can execute it and the program will execute as root.bin.
You can then change the permissions of /bin/su. Try changing them to 4750 (-rwsr-x---), which allows root or any user in the su group to execute it. Then you can put those users you wish to have su privileges in the su group. —Chad Robinson, BRT Technical Services Corporation 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|
- Stunnel Security for Oracle
- The Firebird Project's Firebird Relational Database
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Doing for User Space What We Did for Kernel Space
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 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