Best of Technical Support
I have an HP IDE CD-Writer, so I am using SCSI emulation to use it with cdrecord. Under the 2.2.18 kernel, I could tell the ide-scsi module only to make use of my burner and leave my ATAPI CD-ROM alone. I did this via an append option in lilo.conf:
This worked well, as /dev/hdc is my burner and /dev/hdd is my ATAPI CD-ROM. Unfortunately, under the 2.4 kernel, this no longer works. The ide-scsi module grabs both devices, making /dev/hdd unavailable, preventing cdparanoia from working with it and forcing me to mount it with /dev/scd1. How do I get the same effect under 2.4 and force the ide-scsi module to emulate only /dev/hdc?
—Michael Soulier, firstname.lastname@example.org
What you want is for hdc to do SCSI emulation and hdd to continue to be used as an IDE device. Usually IDE-CD support is disabled and SCSI emulation is enabled so that both drives are seen as SCSI devices. See www.wizball.co.uk/linux/cd_rewriter.php and www.teknospy.com/pages/howtos/cdburn.php for tutorials.
—Paul Christensen, email@example.com
I maintain 39 Red Hat servers and am always adding more (web hosts). I always try to install the bare minimum of packages during an install, figuring that if I don't include something the customer decides they want later, I can always figure out how to add it. Occasionally, a package requested will have such a fun list of dependencies requested that what should be a simple rpm -ivh package.rpm becomes a 30 minute dependency adding game. Is there a simple switch I can enter to have RPM tell me what one package needs before I try to install it?
—Bruce D. Meyer, firstname.lastname@example.org
You describe one of the reasons why many Linux server administrators use Debian Linux instead of a Red Hat derivative. With Debian, it is just a matter of typing apt-get install foo. Last I checked, RPM doesn't have a magic switch to do what you want. One way to do this on Red Hat is to use gnorpm or rpmfind. The problem is that in either case, with RPM-based solutions, RPMs are often incompatible across distributions and even within different versions of the same distribution (like RH 6.2 and RH 7.1). While rpmfind/gnorpm will probably be your best bet, if you get the option to install Debian Linux next time, it would solve all these problems.
—Marc Merlin, email@example.com
One little gem is Red Carpet. Documentation and downloads can be found at the www.Ximian.com web site.
—Paul Christensen, firstname.lastname@example.org
I have a Linux box that acts as my DHCP server, firewall and gateway to the Internet. Many of my clients are visiting Windows users. Is it possible to set up the Linux box to be a print server such that a Windows client can print via the Linux print server without the client having to install printer drivers?
—Danny Patel, email@example.com
I would set up a Samba Share for both the printer and the Windows drivers for that printer.
—Christopher Wingert, firstname.lastname@example.org
You might want to look into using CUPS (Common UNIX Printing System). It supports IPP, LPD, SMB (Windows) and AppSocket (JetDirect) protocols.
—David Brown, email@example.com
I can't execute a shell script with crontab. I get this error:
cannot execute binary file
—Leonardo Fermoselle, firstname.lastname@example.org
Does your script start with #!/bin/sh as the very first characters of the file? It should. If this isn't the problem, was the script written on a DOS machine? Open the file with the joe text editor and if you see funny M characters at the end of every line, that is your problem. You can use a tool found at freshmeat.net/projects/fixdos to fix that.
—Ben Ford, email@example.com
Run the command file /usr/backup/myscript.sh, or load this file in vi and make sure it does not have any junk characters in the file. Make sure that you can run the script from command line.
—Usman Ansari, firstname.lastname@example.org
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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