Best of Technical Support
I'm trying to use umask to set permissions in a directory, but it doesn't allow me to set execute. I use
and when I create a new file the permissions are -rw-rw-rw-.
Can you give me a quick explanation of this command? Thanks. —Ernesto Jardim, firstname.lastname@example.org
umask doesn't set permissions; it uses a mask to clear existing file permissions. The umask is also used by the shell to set initial file permissions on a newly created file. Specifically, permissions in the umask are turned off from 0666. The default umask is commonly 022 (in octal notation). In binary it is 000 010 010 which is equivalent to ----w--w-. When a file is created, the default permissions are rw-rw-rw- (666) and after the umask is applied, they will be rw-r--r-- (644). To set permissions, use the chmod command.
I have two technical questions that I can't seem to solve by reading HOWTOs.
1) Has anything been done for the IDE/ATAPI version of the Iomega Zip drive? Every HOWTO I have read seems to cover only the SCSI and the parallel port versions.
2) I have an HP ScanJet 5P scanner, with complementary Symbios one device SCSI controller. When I boot Linux, it says it doesn't detect any SCSI hosts. Is this normal and what is the reason behind it? —Henk Verleye, email@example.com
1) Newer kernels (like 2.0.35) support IDE/ATAPI removables. Just include IDE/ATAPI FLOPPY support and recompile the kernel.
2) Frankly, I don't know if this type of SCSI controller is supported, but if it is, make sure the ncr53c8xx SCSI driver is compiled into the kernel.
I have one hard drive for Linux Red Hat 5.0 and one for Windows and want to switch them. Linux is on hda1 and Windows is on hdb1. hdb1 is the faster of the two, and I want to move Linux to it and put Windows on hda1. I know how to do the Windows part, but how do I duplicate everything on hda1 to hdb1? hdb1 is a bigger hard drive and has more than twice the speed of hda1. —Jon, LordShroom@hempseed.com
First boot Linux, then mount hdb1 under /mnt with mount /dev/hdb1 /mnt; then, if one partition is all you need to copy, type the following:
cp -a --one-file-system / /mnt
Wait for the copy to finish, then type umount /mnt. If you have more than one file system you want to copy, you have to repeat this for each partition. Now you need to change /etc/lilo.conf so that LILO boots from hdb1 instead.
I am using Red Hat 5.1 and am having some difficulty mounting a Zip disk formatted in Windows 98. The file system is not FAT32; it is FAT16. I can easily mount a Linux EXT2 Zip, but not the Windows 98 one. I'm not sure if I have the relevant information in my FSTAB—maybe someone can tell me what I need. I've used commands like:
mount -t msdos
I've tried many variations of this with no success. Is there something I'm missing? The man mount help seems informative, but yields no solutions —Edward Heshka, firstname.lastname@example.org
The default partition used on a Zip disk under DOS/Windows is the fourth partition. Don't ask me why! Add entries similar to these to your /etc/fstab:
/dev/sdc1 /zip ext2 noauto,rw,user,nosuid,sync /dev/sdc4 /zipdos msdos noauto,rw,user,nosuid,sync,mode=0777
Make sure the mount points exist and you use the correct SCSI device. Check the messages during bootup if you're not sure. Now you can mount a DOS Zip disk with mount /zipdos and an EXT2 Zip disk with mount /zip.
I'm fairly new to Linux. I have succesfully installed Red Hat Linux 5.1 on my laptop and have configured X appropriately. I have made appropriate network settings and I want to use network shares (i.e., directories) that exist in my company's Windows NT domain. Any suggestions would be greatly appreciated. Also, we use MS Exchange for our e-mail and I have had limited success in configuring a POP3 client to hit the server. Thanks in advance. —William B. Winslow, email@example.com
One word: SAMBA. You can find information on SAMBA at http://www.samba.bst.tj/samba/samba.html. Also, read the review in Linux Journal of John Blair's book SAMBA: Integrating UNIX and Windows to see if it is a resource you are interested in using.
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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- Managing Linux Using Puppet
- Doing for User Space What We Did for Kernel Space
- Tech Tip: Really Simple HTTP Server with Python
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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