Read e-book online Beginning Unix PDF

By Paul Love, Joe Merlino, Craig Zimmerman, Jeremy C. Reed, Paul Weinstein

ISBN-10: 0764579940

ISBN-13: 9780764579943

The Unix working approach is the root for a few of cutting-edge most-used systems, together with Mac OS X and Linux. This booklet covers Unix fundamentals for those in addition to the mainly famous solar Solaris and BSD. First, you are going to research Unix terminology, center techniques, method, and the way to log out and in. you will development to customizing your paintings atmosphere and studying instructions. Then you will be able to discover ways to deal with approaches, deal with protection, automate initiatives with shell scripting in Perl, set up Unix courses, and again up your facts.

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Linux, for example, is a variant of Unix that was built from the ground up as a free Unix-like alternative to the expensive commercial Unix versions available when Linux was first created in 1991. Here are some of the more popular flavors of Unix available: Sun Microsystem’s Solaris Unix Yellow Dog Linux (for Apple systems) IBM AIX Santa Cruz Operations SCO OpenServer Hewlett Packard HP-UX SGI IRIX Red Hat Enterprise Linux FreeBSD Fedora Core OpenBSD SUSE Linux NetBSD Debian GNU/Linux OS/390 Unix Mac OS X Plan 9 KNOPPIX Each of these flavors implements its version of Unix in a slightly different way, but even though the implementation of a command may vary on some systems, the core command and its functionality follow the principles of one of the two major variations.

There are three major shells available on most systems: the Bourne shell (also called sh), the C shell (csh), and the Korn shell (ksh). The shell is used almost exclusively via the command line, a text-based mechanism by which the user interacts with the system. The Bourne shell (also simply called Shell) was the first shell for Unix. It is still the most widely available shell on Unix systems, providing a language with which to script programs and basic user functionality to call other programs.

The encrypted version of the password (which can be 13 or more characters depending on the Unix implementation). Because this file is readable only by root, the passwords are more protected than if they were in the openly readable in /etc/passwd file. If this field is blank, the user is not required to enter a password — a very dangerous situation, because only the account name need be discovered for the system to be compromised. There are ways to lock an account (prevent anyone from using it) with this field as well, depending on the version of Unix.

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Beginning Unix by Paul Love, Joe Merlino, Craig Zimmerman, Jeremy C. Reed, Paul Weinstein

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