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

By Douglas W. Topham

A approach V consultant to UNIX and XENIX takes the beginner reader in the course of the positive aspects of the UNIX procedure step by step with out jargon and assumptions in regards to the reader's technical wisdom present in related books. With its transparent reasons, various examles, and easy association, this booklet appeals to many non-technical humans simply starting to paintings with UNIX, in addition to engineers and programmers with past event. somebody who reads this ebook will how to use the gains of UNIX, and the way to change and customise these beneficial properties. it truly is equipped in one of these method that it leads the reader from the UNIX fundamentals to the extra complicated and robust thoughts resembling shell-programming and networking. even supposing the publication is written as creation and reference for the UNIX consumer, it will probably rather well be used as a textbook in undergraduate laptop technology or laptop engineering courses.

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Part of a typical UNIX file system. e user directory binary directory device directory misceUaneous directory temporary directory To identify one of the user home directories, type another slash after /usr, foUowed by the account name, as in /usr/dan and /usr/ann. In each case here, the first slash refers to the root, while the second indicates that dan and ann are subdirectories of usr. ) To identify the subdirectories under dan and ann, we continue with the same conventions. a. b caUed intro, search, and restore.

UNIX also allows you to modify the command line $ ls > files to redirect the output of Is from your screen to a file named files. If files does not exist when you issue the Is command, it will be created by the shell; if files does already exist, its contents will be overwritten. A common use of redirection of output is the joining together, or concatenation of several files, using the UNIX cat command. To concatenate files file_ 1, file_2, and file_3 and store the resulting text in another file called append, type the following after the UNIX shell prompt and press (RETURN): Then, to concatenate three more files and add the resulting text to append, rat her than overwrite it, use another redirection symbol (»).

2 memos letters proposals specs In each of these three groups of characters, there is one permission for reading, one for writing, and one for executing. Reading, writing, and executing have different meanings for ordinary files and directories: For an ordinary file, permissions are defined as follows: • read permission means you may look at the contents of the file • write permission me ans you may change the contents of the file • execute permission means you may type the name of the file m a command line as if the file were a UNIX command.

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