By Jon Lasser

ISBN-10: 078972376X

ISBN-13: 9780789723765

Unix has a name for being cryptic and tough to benefit, however it does not must be that approach. imagine Unix takes an identical method of that of a grammar ebook. instead of educating person phrases or words like such a lot books, imagine Unix teaches the set of logical buildings to be realized. Myriad examples assist you research person instructions, and perform difficulties on the finish of adverse sections assist you examine the sensible aspect of Unix. powerful recognition is paid to studying tips to learn "man pages," the traditional documentation on all Unix platforms, together with Linux. whereas such a lot books easily let you know that guy pages exist and spend your time educating tips on how to use the guy command, none spend any major volume of house instructing the way to use the content material of the guy pages. no matter if you're misplaced on the Unix command urged, you could examine subsystems which are particular to the Unix flavor.

Amazon.com overview the numerous editions of the Unix working approach require use of a method of notion that is considerably varied from the single that is required by means of easier working structures. Think Unix introduces readers to big basic and intermediate Unix instructions and, within the procedure, inculcates them within the Unix state of mind. it is a invaluable target in a global with extra Linux clients than ever, and writer Jon Lasser accomplishes it. he is either a able author and a a professional person of Unix shell instructions. Lasser makes use of bash below purple Hat Linux in so much examples--which often practice both good to different Unix variants--and makes asides approximately different shells and environments, as wanted.

Like Unix itself, this e-book is extremely literate, and rewards those who find themselves keen to learn via motives of the command strings that pepper the paragraphs. the simplest approach is to learn this booklet from disguise to hide, imagining that you are sitting via a seminar. it's possible you'll learn about a few of the themes which are awarded, yet it truly is most probably that anything in each bankruptcy will increase the intensity of your Unix wisdom. A priceless pedagogical trick: Lasser has integrated perform difficulties right here and there. a standard one: "Display the string 'Today's date is:,' through trendy date." try to be in a position to remedy those by way of examining the examples rigorously, yet you will find ideas within the again of the e-book, in the event you desire them. it is a nice publication for Unix novices. --David Wall

Topics covered: The Unix working approach and its strange approach of permitting clients to thread instructions jointly in strong, versatile sequences. instructions and methods are explored that experience to do with records, approaches, piping, shell instructions, shell scripting, and the necessities of the X windowing process.

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Numeric Permissions Like almost everything else on Unix, permissions have a number associated with them. It’s generally considered that permissions are a group of four digits, each between 0 and 7. Each of those digits represents a group of three permissions, each of which is a yes/no answer. From left to right, those digits represent special permissions, user permissions, group permissions, and other permissions. Digression: Computer Math It’s okay to skip this section if you don’t care about the math behind the permission numbers, but I wouldn’t include it here if I didn’t think it was at least interesting and probably useful at some point.

Because Unix enables you to specify permissions for the owner, the group, and other users, the execute bit enables the administrator to restrict the use of dangerous programs. Yes, they do actually represent individual ones and zeros. I’ll return to this later. 17. We’ll talk more about scripts later, but suffice it to say, a user might well want to turn a normal file into an executable. Files and Processes Chapter 2 Directories treat the execute permission differently. If a directory does not have execute permissions, that user (or group, or other users on the system) can’t cd into that directory and can’t look at information about the files in that directory.

4. Look for your Unix vendor’s Web site and look for documentation related to your Unix flavor. In particular, look for manuals that provide information other than that given in man pages. 5. Locate the manuals that came with your Unix system. If you use Unix in an institutional environment, find out whether a publicly accessible set of manuals is available. 27 28 Part I Unix Concepts HARD LINKS • SOFT LINKS • REDIRECTION AND PIPES REDIRECTING STDERR • NAME LOOKUP • ROUTING READING MAIL VIA POP3 • VI AND REGULAR EXPRESSIONS FILENAME GLOBBING VERSUS REGEXPS • INTERACTIVE COMMAND-LINE EDITING • HISTORY SUBSTITUTION • JOB CONTROL • VARIABLES AND QUOTING • CONDITIONAL EXECUTION • WHILE AND UNTIL LOOPS • ALIASES AND FUNCTIONS • THE X WINDOW CLIENT/SERVER MODEL WIDGETS AND TOOLKITS • CONFIGURING X • PERMISSIONS AND OWNERSHIP • USERS AND GROUPS • HARD LINKS • SOFT LINKS • REDIRECTION AND PIPES • REDIRECTING STDERR NAME LOOKUP • ROUTING READING MAIL VIA POP3 • VI AND REGULAR EXPRESSIONS FILENAME GLOBBING VERSUS REGEXPS • INTERACTIVE COMMAND-LINE EDITING • HISTORY SUBSTITUTION • JOB CONTROL • VARIABLES AND QUOTING CONDITIONAL EXECUTION • WHILE AND UNTIL LOOPS • ALIASES AND FUNCTIONS • THE X WINDOW CLIENT/SERVER MODEL WIDGETS AND TOOLKITS • CONFIGURING X • PERMISSIONS AND OWNERSHIP • USERS AND GROUPS HARD LINKS • SOFT LINKS • REDIRECTION AND PIPES • REDIRECTING STDERR • NAME LOOKUP • ROUTING READING MAIL VIA POP3 • VI AND REGULAR EXPRESSIONS • FILENAME GLOBBING VERSUS REGEXPS • INTERACTIVE COMMAND-LINE EDITING • HISTORY SUBSTITUTION • JOB CONTROL • VARIABLES AND QUOTING 2 Files and Processes 30 Part I Unix Concepts If you’ve been watching closely, you might have noticed that I’ve already begun to discuss files.

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Think Unix by Jon Lasser


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