basic bash shell scripting pdf

... 206 BASH_ COMMAND 206 BASH_ EXECUTION_STRING 206 BASH_ LINENO 206 BASH_ REMATCH 206 BASH_ SOURCE .206 BASH_ SUBSHELL 206 BASH_ VERSINFO ... CONTENTS ■Appendix: Shell Variables 205 BASH 205 BASHPID .205 BASH_ ALIASES 205 BASH_ ARGC 205 BASH_ ARGV 205 BASH_ CMDS ... free, open-source shell, introduced bash Like all modern shells, bash is a POSIX shell It also has many added enhancements Which Version of Bash? This book is aimed at users of bash- 3 and later,...

Ngày tải lên: 17/02/2014, 17:20

... current shell Display the currently used shell as follows: echo $SHELL Or, you can also use: echo $0 15 www.it-ebooks.info Shell Something Out For example: $ echo $SHELL /bin /bash $ echo $0 bash ... shell script called bashrc, which is located in the home directory of the user (~/ bashrc) The bash shell also maintains a history of commands run by the user It is available in the file ~/ .bash_ history ... Linux Shell Scripting Cookbook Solve real-world shell scripting problems with over 110 simple but incredibly effective recipes Sarath Lakshman BIRMINGHAM - MUMBAI www.it-ebooks.info Linux Shell Scripting...

Ngày tải lên: 21/02/2014, 19:20

... Linux Shell Scripting with Bash TEAM LinG Linux Shell Scripting with Bash Ken O Burtch DEVELOPER’S LIBRARY Sams Publishing, 800 East 96th Street, Indianapolis, Indiana 46240 Linux Shell Scripting ... install Bash in For example, —prefix=$HOME or — prefix=$HOME /bash might be good choices Bash and Other Scripting Tools Ksh, Perl, and Python are similar, but not identical, to Bash The Korn shell ... Bourne shell A public domain version exists called pdksh Korn shell is a popular shell on many commercial Unix systems Most, but not all, of the Korn shell s features work under Bash Both shells...

Ngày tải lên: 24/04/2014, 09:16

... default shell environment the Korn shell (ksh); the standard shell on Linux is the Bourne Again shell (bash) shell, and some others use Bourne shell (sh) as the default You can find your default shell ... Chapter Scripting Quick Start and Review Case Sensitivity Unix Special Characters Shells Shell Scripts Functions A Function Has the Form Running a Shell Script 1 2 2 3 Declare the Shell in the Shell ... flavor of shell has its own set of recognized commands and functions This book works entirely with the Korn shell Korn Shell /bin/ksh OR /usr/bin/ksh Shell Scripts The basic concept of a shell script...

Ngày tải lên: 09/08/2014, 16:20

... as a parameter to the shell script name Using the shell script in Listing 2.1, you create a 7,500-line file with the following syntax: # mk_large_file.ksh 7500 The full shell script is shown ... fi Listing 4.5 countdown.ksh shell script (continued) Let’s review the countdown.ksh shell script in Listing 4.5 from the top We start the script by defining the shell script’s filename We use ... mk_large_file.ksh shell script listing (continued) Each line produced by the mk_large_file.ksh script is the same length The user specifies the total number of lines to create as a parameter to the shell...

Ngày tải lên: 09/08/2014, 16:20

... transfers Basically we are going to combine the shell scripts in Listings 17.1 and 17.4 We are also going to add the functionality to add pre- and post-ftp events Let’s start by looking at the shell ... excellent, which gives us several options when creating shell scripts To control all of the printing and queuing at one time you really not need a shell script The following two commands can start ... done Listing 16.7 print_UP_HP-UX.ksh shell script listing Print Queue Hell: Keeping the Printers Printing I want to point out a nice little trick in the shell script in Listing 16.7 In both...

Ngày tải lên: 09/08/2014, 16:20

... wanted to make this new shell POSIX compatible, thus bash (the Bourne again shell) was born Like the Korn shell bash was based upon the Bourne shells language and like the Korn shell, it also pinched ... from the C shell and other operating systems 12 Unix Shells     The Bourne Shell The Bourne shell is the original UNIX shell program It is very widely used You can start the Bourne shell —if ... very similar to that of the Bourne shell The Korn shell, 14 however, is more interactive Unix Shells       The C shell The C shell is a very commonly used shell Its programming structure...

Ngày tải lên: 24/10/2014, 10:51

... Expert Shell Scripting ■■■ Ron Peters Expert Shell Scripting Copyright © 2009 by Ron Peters All rights reserved No part of this ... xxi PART ■CHAPTER ■■■ Basic Scripting Techniques Shell Script Debugging Shell Trace Options ... grow continually You might be aware of the large number of shell- scripting books and online resources aiding in the mastery of shell scripting Many are excellent and cover a wide range of topics...

Ngày tải lên: 20/08/2012, 13:59

... SCHAUM’S OUTLINE OF THEORY AND PROBLEMS of BASIC CIRCUIT ANALYSIS Second Edition JOHN O’MALLEY, Ph.D Professor of Electrical Engineering University ... teaching courses in electric circuit analysis since 1959 Schaum’s Outline of Theory and Problems of BASIC CIRCUIT ANALYSIS Copyright 1992,1982 by The McGraw-Hill Companies Inc All rights reserved ... Congress Cstaloging-in-Publication Data O’Malley John Schaum’s outline of theory and problems of basic circuit analysis ’ John O’Malley 2nd ed p c.m (Schaum’s outline series) Includes index ISBN...

Ngày tải lên: 13/12/2013, 05:15

... find vd and id ? iR id R :) Vs + _ id + vd – nonlinear device vd Prof C.K Tse: Diode circuits 13 Basic load line construction + vR – iR i R :) Vs + _ id + vd – slope = –1/R id device characteristic...

Ngày tải lên: 13/12/2013, 22:15

... by AT&T's System V Unix /bin/bsh BASH /bin /bash shell The standard shell for Linux, based on the original Unix Bourne shell According to its man page, /bin /bash2 BASH is "ultimately intended" to ... language Korn /bin/ksh shell Z shell The third Unix shell, added many of the features of the C shell to the original Bourne shell /bin/zsh A feature-packed shell based on the Korn shell 13.1.2 Why ... on the BASH shell Most Linux systems are configured to automatically start a BASH shell on your behalf when you log in; so, you don't generally need to be much concerned about choosing a shell...

Ngày tải lên: 14/12/2013, 13:15

... (job control) Korn shell C shell Bạn thay đổi shell mặc định sang loại khác cách sử dụng lệnh: Ví dụ chuyển từ Bourne shell sang C shell: exec csh đổi shell lệnh: chsh [ ] Cấu trúc lệnh ... Linux có shell tơng tự bạn sử dụng giới thiệu shell với hệ thống Linux Những loại shell thời Hiện có nhiều loại shell đợc sử dụng hệ thống Unix, nhng đề cập đến loại phổ biến, là: - Bourne shell, ... phổ biến tồn nh: Bourne shell, Korn shell, C shell, Mỗi loại có khác nhng tất cung cấp đầy đủ công cụ để thiết lập môi trờng giao tiếp ngời sử dụng Unix Mục đích shell Shell có mục đích nh sau:...

Ngày tải lên: 15/12/2013, 20:15

... another For shell script, $ myshell foo bar Shell Script name i.e myshell First command line argument passed to myshell i.e foo Second command line argument passed to myshell i.e bar In shell if ... popular shells (In MS-DOS, Shell name is COMMAND.COM which is also used for same purpose, but it's not as powerful as our Linux Shells are!) Shell Name Developed by BASH ( Bourne-Again SHell ) ... Linux Shell Scripting Tutorial Linux Shell Scripting Tutorial Ver 1.0 Written by Vivek G Gite INDEX q Introduction r r Shell r How to use Shell r q Kernel Common Linux...

Ngày tải lên: 24/01/2014, 02:20

... that are contained in the document Basic newborn resuscitation: a practical guide As this document is over a decade old, a process to update the guidelines on basic newborn resuscitation was initiated ... that are contained in the document Basic newborn resuscitation: a practical guide As this document is over a decade old, a process to update the guidelines on basic newborn resuscitation was initiated ... and to improve their knowledge, skills and performance in basic newborn resuscitation Population of interest The guidelines focus on basic resuscitation of newborns born in resource-limited settings...

Ngày tải lên: 18/02/2014, 15:20

... option Variables 13 BASH_ LINENO BASH_ REMATCH BASH_ SOURCE BASH_ SUBSHELL BASH_ VERSINFO[0] BASH_ VERSINFO[1] BASH_ VERSINFO[2] BASH_ VERSINFO[3] BASH_ VERSINFO[4] BASH_ VERSINFO[5] BASH_ VERSION COMP_CWORD ... only when a shell is a login shell Bash reads these files: Chapter – The Bash Shell /etc/profile Executed automatically at login The first file found from this list: ˜/ .bash_ profile, ˜/ .bash_ login, ... Chapter – The Bash Shell • Internationalization facilities • An arithmetic for loop Invoking the Shell The command interpreter for the Bash shell (bash) can be invoked as follows: bash [options]...

Ngày tải lên: 20/02/2014, 11:20

... Glaucoma - Basic and Clinical Aspects http://dx.doi.org/10.5772/45915 Edited by Shimon Rumelt Contributors ... www.intechopen.com Additional hard copies can be obtained from orders@intechopen.com Glaucoma - Basic and Clinical Aspects, Edited by Shimon Rumelt p cm ISBN 978-953-51-1064-4 free online editions ... editions of InTech Books and Journals can be found at www.intechopen.com Contents Preface IX Section Basic Aspects Chapter Anatomy of Ciliary Body, Ciliary Processes, Anterior Chamber Angle and Collector...

Ngày tải lên: 17/03/2014, 12:20

... Unix tools, together with the standard shell, to get your job done This is the art of shell scripting Shell scripting requires not just a knowledge of the shell language, but also a knowledge of ... 2.6 2.7 2.8 2.9 Scripting Languages Versus Compiled Languages Why Use a Shell Script? A Simple Script Self-Contained Scripts: The #! First Line Basic Shell Constructs Accessing Shell Script Arguments ... describing compiled languages and scripting languages, and the tradeoffs between them Then it moves on, covering the very basics of shell scripting with two simple but useful shell scripts The coverage...

Ngày tải lên: 19/03/2014, 13:32

... Third Edition bash Basics 1.1 What Is a Shell? 1.2 Scope of This Book 1.3 History of UNIX Shells 1.3.1 The Bourne Again Shell 1.3.2 Features of bash 1.4 Getting bash 1.5 Interactive Shell Use 1.5.1 ... Appendix A compares bash to several similar shells, including the standard Bourne shell, the POSIX shell standard, the Korn shell (ksh), the public-domain Korn shell (pdksh), and the Z Shell (zsh) Appendix ... examples but you don't use bash as your login shell, you must put the following line at the top of each shell script: #!/bin /bash If bash isn't installed as the file /bin /bash, substitute its pathname...

Ngày tải lên: 19/03/2014, 13:38