Mastering Linux shell scripting : master the complexities of Bash shell scripting and unlock the power of shell for your enterprise /: master the complexities of Bash shell scripting and unlock the power of shell for your enterprise. (2015)

• Record Type: Book
• Further Information: Note: Andrew Mallett.
• Authors: Mallett, Andrew
• Contents: Cover ; Copyright; Credits; About the Author; About the Reviewer; www.PacktPub.com; Table of Contents; Preface; Chapter 1: What and Why of Scripting with Bash ; Bash vulnerabilities; The bash command hierarchy; Command type; Command PATH; Preparing text editors for scripting; Configuring vim; Configuring nano; Configuring gedit; Creating and executing scripts; Hello World!; Executing the script; Checking the exit status; Ensuring a unique name; Hello Dolly!; Running the script with arguments; The importance of correct quotes; Printing the script name; Debugging your scripts; Summary. Chapter 2: Creating Interactive Scripts Using echo with options; Basic script using read; Script comments; Enhancing scripts with read prompts; Limiting the number of entered characters; Controlling the visibility of entered text; Enhancing learning with simple scripts; Backing-up with scripts; Connecting to a server; Version 1 -- ping; Version 2 -- SSH; Version 3 -- MySQL/MariaDB; Summary; Chapter 3: Conditions Attached ; Simple decision paths using command-line lists; Verifying user input with lists; Using the test shell builtin; Testing strings; Testing integers; Testing file types. Creating conditional statements using ifExtending if with else; More conditions with elif; Creating the backup2.sh using elif; Using case statements; Recipe -- building a front-end with grep; Summary; Chapter 4: Creating Code Snippets ; Abbreviations; Using code snippets; Bringing color to the terminal; Summary; Chapter 5: Alternative Syntax ; Recapping test; Testing files; Adding logic; Square brackets as not seen before; Providing parameter defaults; Variables; Special parameters; Setting defaults; When in doubt -- Quote!; Advanced test using [[; Whitespace; Other advanced features. Pattern matchingRegular expressions; Regular expression script; Arithmetic operations using ((; Simple math; Parameter manipulation; Standard arithmetic tests; Summary; Chapter 6: Iterating with Loops ; For loops; Controlling the loop; While loops and until loops; Reading input from files; Creating operator menus; Summary; Chapter 7: Creating Building Blocks with Functions ; Introducing functions; Passing parameters to functions; Returning values from functions; Using functions in menus; Summary; Chapter 8: Introducing sed ; Using grep to display text. Displaying received data on an interfaceDisplaying user account data; Listing the number of CPUs in a system; Parsing CSV files; The CSV file; Isolating catalog entries; Using regular expressions; Working with alternate spellings; How many words have four consecutive vowels?; RE anchors; Understanding the basics of sed; Substituting command; Editing the file; Summary; Chapter 9: Automating Apache Virtual Hosts ; Apache name-based Virtual Hosts; Creating the Virtual Hosts template; First steps; Isolating lines; sed script files; Automating Virtual Host creation.
• Publisher Details: Birmingham : Packt Publishing
• Publication Date: 2015
• Extent: 1 online resource, illustrations
• Subjects: 005.446076; COMPUTERS -- Programming Languages -- C; COMPUTERS / Operating Systems / Linux; COMPUTERS / Operating Systems / UNIX; COMPUTERS -- System Administration -- Linux & UNIX Administration; Electronic books
• Languages: English
• ISBNs: 9781784397593; 1784397598
• Related ISBNs: 1784396974; 9781784396978
• Notes: Note: Online resource; title from PDF title page (EBSCO, viewed May 3, 2016)
• Access Rights: Legal Deposit; Only available on premises controlled by the deposit library and to one user at any one time; The Legal Deposit Libraries (Non-Print Works) Regulations (UK).
• Access Usage: Restricted: Printing from this resource is governed by The Legal Deposit Libraries (Non-Print Works) Regulations (UK) and UK copyright law currently in force.