Linux Shell Scripting - GL375 Course Outline

(2 Days)

Overview

The GL375 is designed to provide the skills necessary to automate tasks on a Unix or Linux system. Systems Administrators and Developers alike can avoid errors, save time and money by replacing repetitive work patterns with shell scripts. Care has been taken to present the GL375 in a format that benefits all students, with or without previous programming experience. Guru Labs believes that the best way to learn shell scripting is writing shell scripts. For this reason, lab time is emphasized. Early labs present the scripting process step by step, while later labs are presented in a challenge format. While official solutions to each lab task are provided, students are encouraged to create their own before examining the solution. In this way, more experienced students are challenged without overwhelming the less experienced.

Current Version: H02

Prerequisites

Solid understanding of Unix-based systems and proficiency on the Unix or Linux command line.

At Course Completion

Supported Distributions:Red Hat Enterprise Linux 7SUSE Linux Enterprise 12

Course Outline

Course Outline:

  1. Introduction to the Shell

    1. Shell Script Strengths and Weaknesses
    2. Shells
    3. Switching User Contexts
    4. Example Shell Script
    5. Shell and Environment Variables
    6. Key Environment Variables
    7. Which and Type
    8. General Quoting Rules
    9. Nesting Commands
    10. Help from Commands and Documentation
    11. whereis
    12. Getting Help Within the Graphical Desktop
    13. Getting Help with man & info

    Lab Tasks

    1. Shell Variables
    2. Shell Meta-Characters
    3. Command Substitution

  2. Shell Scripting Basics

    1. Positional Parameters
    2. Input & Output
    3. printf
    4. alias
    5. Functions
    6. Colors in Scripts
    7. Custom Bash Prompts

    Lab Tasks

    1. Aliases
    2. Bash Login Scripts
    3. Create

      userinfo

      and

      sysinfo

      functions

  3. Working with Files

    1. Communication Channels
    2. File Redirection
    3. Piping Commands Together
    4. Doing Math
    5. Filesystem Structures
    6. Determining Disk Usage With df and du
    7. cron
    8. The crontab Command
    9. crontab Format
    10. /etc/cron./ Directories
    11. Sending Email with mailx

    Lab Tasks

    1. Disk and Filesystem Usage
    2. Redirection and Pipes

  4. Regular Expressions

    1. Searching Inside Files
    2. Regular Expression Overview
    3. Regular Expressions
    4. RE Character Classes
    5. Regex Quantifiers
    6. RE Parenthesis
    7. The Streaming Editor

    Lab Tasks

    1. Pattern Matching with Regular Expressions
    2. Extended Regular Expressions
    3. Using Regular Expressions With sed

  5. Branching and Looping

    1. Exit Status
    2. Comparisons with test
    3. Conditional Statements
    4. Flow Control: case
    5. Flow Control: while and until Loops
    6. The borne for-Loop
    7. Flow Control: select

    Lab Tasks

    1. Reporting User Statistics
    2. Monitoring Filesystem Usage

  6. Data Munging

    1. Text Processing with Awk
    2. Text Sorting
    3. Duplicate Removal Utility
    4. Extracting Columns of Text

    Lab Tasks

    1. Create

      rmhost

      function

    2. Create

      showenv

      function

    3. Parsing Mail Server Logs
    4. Fixing Incorrect Files

  7. Security, Whitespace, and Other Gotchas

    1. Gotcha: Quoting Variables
    2. Gotcha: Locales
    3. Gotchas: Maximum Command Length
    4. Gotcha: Whitespace in for Loops
    5. Reading Files with while
    6. Gotcha: $IFS
    7. Gotcha: Printing in .bashrc
    8. Gotcha: Aliases

    Lab Tasks

    1. Renaming MP3 Files
    2. Split and Display $PATH
    3. A tar-based Backup

  1. Challenge

    1. Apache Configuration Files
    2. httpd.conf – VirtualHost Configuration

    Lab Tasks

    1. Automated Virtual Host Provisioning

  2. Emacs

    1. Emacs
    2. The Emacs Interface
    3. Basic Emacs
    4. More Emacs Commands

    Lab Tasks

    1. Text Editing with Emacs

  3. The Secure Shell (SSH)

    1. OpenSSH Client & Server Configuration
    2. Accessing Remote Shells
    3. Transferring Files
    4. SSH Key Management