A System V Guide to UNIX and XENIX by Douglas W. Topham

By Douglas W. Topham

A procedure V advisor to UNIX and XENIX takes the amateur reader during the good points of the UNIX procedure step by step with out jargon and assumptions concerning the reader's technical wisdom present in related books. With its transparent causes, quite a few examles, and easy association, this ebook appeals to many non-technical humans simply commencing to paintings with UNIX, in addition to engineers and programmers with past event. someone who reads this publication will how to use the positive aspects of UNIX, and the way to switch and customise these good points. it's equipped in this kind of approach that it leads the reader from the UNIX fundamentals to the extra complicated and robust options equivalent to shell-programming and networking. even if the e-book is written as creation and reference for the UNIX consumer, it may possibly rather well be used as a textbook in undergraduate machine technological know-how or machine engineering courses.

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U SING THE DESK CALCULATOR dc Use the dc command to call up a simple interactive desk calculator. Here is a typical session with dc, with comments to the right of each line: 4 CaU up the desk calculator Enter 3 Enter 4 + Perform addition $ da 3 20 Using the ealculators p Display the result 7 3+p Add 3 and display the result 10 4*p Multiply by 4 and display the result 40 2/p Divide by 2 and display the result 20 5-p Subtraet 5 and display the result 15 q Exit the desk ealculator $ Other features include number bases, scaling, functions, subscripts, and logical contro\.

If a pathname used to access a file begins with a slash (I), then the search for the file begins at the root directory. Such a pathname is called an absolute pathname (or Jull pathname), since it always begins with the root directory. If a pathname begins with a simple filename, then the search for the file begins at your current directory. Such a pathname is called a relative pathname, since the file is accessed with respect to your current directory. Later in this chapter we'll discuss procedures for giving other users permission to access to your directories and files.

Since ControlD often means end-of-file or end-of-transmission to UNIX, there may be times when you will have to type Control-D several times to log yourself out. Some systems may require that you also press other keys. If you are using the C shell and the variable called "ignoreeof" is set, you have to type 10gout and press (RETURN). ) 2. Getting Started with UNIX $ 15 [Press Control-D-nothing displayed] login: When you have successfully logged out, the "login" prompt reappears on the screen. It isn't that UNIX doesn't like to see a user log out; it's just that UNIX doesn't have anything else to say.

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