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Submit UNIX Questions |
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The Computer Education Techniques knowledge base is a service for answering questions, inclusive of the research and validation of the accuracy of information in the public domain. Citation of source documentation and examples are used to provide answers to the questions. Utilization of the information and reliance on the answers received through this web site is done at your own risk.
| Q | We are evaluating whether to utilize an open source UNIX or Linux operating system for our WebLogic Server and Oracle database? Are there any limitations in the installation and boot partition? |
| A | In 2009, Oracle Corporation
acquired Sun Microsystems hardware and open source software: Solaris
operating system, MySQL database, and Java programming language. Our recommendation would be to use Solaris. Starting with the Solaris 10 release, it is now possible to install and boot the Solaris OS from a disk that is up to 2 Tbytes in size. The VTOC label can be used on a disk of any size; however, the addressable space by the VTOC is limited to 2 terabytes. This feature enables disks that are larger than 2 terabytes to be used as boot drive. It removes the limitations of earlier releases of Solaris where it was not possible to install and boot the drive from a disk that was greater than 1 terabyte in size. |
| Q | What is new with ZFS and why is it considered an important component of UNIX-variant operating systems? |
| A | ZFS is a significant
enhancement to file system design and is already in use on Linux, Mac OS X,
and FreeBSD systems. ZFS file systems are built on top of the concept of pools or "zpools". Instead of utilizing a volume manager on top of multiple drives, ZFS joins devices into storage pools - large data stores from which file systems can be built. This serves to greatly reduce the complexity and administrative overhead. ZFS file systems are not constrained by initial partitioning decisions. File systems can be added to as needed and new devices can be added at any time. This serves to facilitate the enlargement of the space available to all file systems. As a 128 bit file system, it can store 18 billion times more data than current 64-bit file systems. The maximum size of a single file has been increased by a factor of 16 times 2 as compared to the maximum size of a file in a 64 bit file system. ZFS addresses many of the issues associated with file system corruption and the problems associated with freeing free blocks crashes. The zpool and zfs commands are used to work with ZFS. Example 1:
Additional file systems can then be created within this file system. Example 2:
Example 3:
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| Q | What is the difference between the various ZIP formats: ZIP, GZIP, and PKZIP? |
| A | ZIP is an archive file format,
popularized on PCs, that contains multiple compressed files.
GZIP comes from a GNU project. It is a one file subset of the ZIP format. It is not possible to place a whole directory into a GZIP archive, just a single file. It's intended for compressing a tarball of many files. PKZIP is a commercially available program that creates zip files. All three use the deflate compression format, which is based on the LZ77 algorithm. This compression is also used by the ZLIB library and the PNG graphics file format PNG - (which uses ZLIB). |
| Q | Our company uses multiple variants of UNIX and accordingly I will be required to write scripts that will work in different Shells. Will SYS-ED UNIX courses be able to accommodate my needs? |
| A | There are two main class of
shells:
There is also a rc which most people consider to be in a class by itself. We demonstrate and teach how to write scripts that will work for the shells both from the Bourne shell category and the C shell category. |
| Q |
I am a mainframe programmer and need to get a sound foundation in the UNIX operating system. What skillset do I need and what UNIX training course sequence do you recommend? |
| A |
For users, new administrators, and programmers, we
would suggest the following UNIX courses:
A tailored UNIX training program for administrators and power developers can be selected from the following courses:
Our Director of Education will be available to explain and demonstrate how our UNIX training programs can incorporate your project specifications. |
| Q |
I work for a government municipality in a PC Windows environment. Will it be difficult to learn UNIX? |
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| A | Your previous experience with
non-UNIX operating systems will serve as a good foundation for learning
UNIX. Administering a UNIX system is not for novices. The UNIX operating
system is more "detail oriented" than Microsoft DOS/Windows. However there
is a commonality between DOS and UNIX commands.
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| Q | I want to make sure that the version of UNIX used in class matches the version that I use at work. |
| A | The version can be ascertained by using the uname command. It is standard policy for SYS-ED to use the newest version of an operating system, and in the case of UNIX, the newest version of that variant. Upon request we will set up operating systems specific to what you utilize back on the job. |
| Q | I have an immediate need to learn how to set access privileges for my files. Which UNIX course should I taken in order to master the UNIX file system and become a network administrator? |
| A | The UNIX file access attributes
are different from their DOS counterparts. In UNIX, the read, write, and
execute privileges can be set according to who the user is. The privileges are set using the chmod command:
Our recommendation would be to take the UNIX: Fundamentals - Level 1 course. |
| Q | What is Linux and does SYS-ED offer Linux courses? |
| A | Linux is a variant of the UNIX
operating system. Every Linux system is based on the Linux kernel. The
kernel manages computer hardware, performs multi-tasking and other essential
things. These low-level functions are used by other programs. More commonly,
"Linux" refers to the Linux Operating System. Yes, we offer both Linux courses and integrated training programs.
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| Q | I will be coding and maintaining AIX on a z/OS system. Does SYS-ED offer AIX courses? |
| A | Yes, we offer AIX courses, but only on a private basis. |
| Q | We are interested in learning Solaris. Our company is using Solaris 2.x, 9, and Solaris 10. Which version would be best for me to learn? |
| A | There are differences between
the different versions of the Solaris Operating System. However, there would
be minimal impact on a Solaris fundamentals course. The core content of a Solaris Fundamentals course would remain:
However, it is universally accepted that, all things being equal, the newest version of an operating system is the best one to learn. |
| Q | In the early 1980’s I worked for an organization which used UNIX as its primary operating system. In my current position (with a different organization), I am now involved in evaluating Solaris as one of our mainstay operating systems. Does SYS-ED train on Solaris and how do you address the differences among the versions? |
| A | You are not alone, for many IT
professionals, the future is indeed to a large degree going back to the
past! Yes, we do train on Solaris and all our courses address and
demonstrate the changes in commands and the discontinued and new features. Here is a concise summary: Changes in Commands The following commands have changed: Removal of Features A number of features have been removed including Netscape, admintool , /var/adm/passwd, PC fileviewer and others. Enhancements to New Features Several changes were made to sendmail and NFS; mostly for administrators. New Features The new features of Solaris will be listed/discussed and available for demonstration on the instructor’s machine.
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