By Douglas W. Topham

A method V advisor to UNIX and XENIX takes the beginner reader throughout the gains of the UNIX approach step by step with out jargon and assumptions in regards to the reader's technical wisdom present in comparable books. With its transparent causes, various examles, and simple association, this booklet appeals to many non-technical humans simply starting to paintings with UNIX, in addition to engineers and programmers with earlier adventure. someone who reads this ebook will the way to use the gains of UNIX, and the way to change and customise these positive factors. it truly is geared up in this sort of approach that it leads the reader from the UNIX fundamentals to the extra complicated and robust innovations corresponding to shell-programming and networking. even if the e-book is written as advent and reference for the UNIX person, it could possibly rather well be used as a textbook in undergraduate laptop technology or desktop engineering courses.

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O In the space after the "Password" prompt, type your password (which will not appear on the screen) and press (RETURN). o After a brief pause, you will see something like this: login: robin Password: Last login: Tue Jan 15 08:17:26 on tty03 * * * * * * * * * * * * * * * * * * * * * * * * * * * * We1come to UNI X System V January 1990 * * * * * * * * * * * * * * * * * * * * * * * * * * * * $ Congratulations! You have just successfully logged in. The dollar sign ( $), percent sign (%), or other symbol in front of the cursor is called the UNIX shell prompt.

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. It goes without saying that you can access only those directories and files for which you have permission.

But as this example shows, you always have the option in UNIX of splitting a long line of input. By entering be -I at the command line instead of be, you can also invoke a mathematicallibrary, which includes sine (s), eosine (c), arctangent (a), exponential (e), naturallogarithm (1), and Bessel (j (n, x) ) functions. By entering be file(s) instead of be, you can have be read statements from one or more files before accepting keyboard input. This allows you to store longer functions in files instead of having to type them over again every time you want to use them.

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