BASH Programming

• An understanding of basic Linux commands and file system navigation
• Experience with shell usage and simple text editing on Linux
• Completion of the "Introduction to Linux" course is recommended but not required

Audience

• Linux users who want to automate tasks using shell scripting
• System administrators looking to optimize server management and operations
• Developers and IT professionals seeking to enhance their Linux programming skills

BASH (Bourne Again Shell) is a powerful command-line interface and scripting language used in Linux for task automation, system management, and application development.

This instructor-led, live training (online or onsite) is aimed at beginner and intermediate-level Linux users, system administrators, and developers who wish to gain hands-on experience in creating efficient and effective shell scripts.

By the end of this training, participants will be able to:

• Understand how the shell works and interact with Linux using BASH.
• Write, debug, and execute BASH scripts to automate repetitive tasks.
• Implement conditional statements, loops, and functions in scripts for enhanced functionality.
• Process and manipulate text files, search for patterns, and work with streams effectively.

Format of the Course

• Interactive lecture and discussion.
• Lots of exercises and practice.
• Hands-on implementation in a live-lab environment.

Course Customization Options

• To request a customized training for this course, please contact us to arrange.

The simplest script

Choosing the shell (magic number #!, Sha-bang)

Calling the script

External and built-in commands

Some special characters

• Comment (#)
• End of Line (;)
• An empty statement (:)
• Redirection of input output (>, <, >>)
• Redirecting output
• Redirection of input
• Stream (|)
• Start the process in the background (&)

Variables and Parameters

• Destruction of variables (unset)
• Variable with a null value
• Save the result to a variable (backquotes ``)
• Parameters request ($ 0, $ #, $ 1, $ 2, $ 3 ...)
• Manual shift
• Quoting.
• Escape character (\)

Regular Expressions

Conditional statements

• The if / then
• The if / then / else
• Nesting if statements
• The if / elif
• case statement
• Operators
• Operators and, or (&&, | |)
• test command

Completing scrypt

The exit statement

Use the status of completion of the program in a script ($?)

Tests and Operators

• Operators text file
• Tests the file type
• Test file attributes

Comparison operators

• Comparing arithmetic using the command if
• Integer comparison operators
• Comparing strings
• Comparing the complex (and, or)
• Nesting comparison operators
• The assignment operator
• Arithmetic operators
• Operators operations on bits (bitwise operators)
• Logical operators
• Numeric constants

Loopa

• The loop for / in
• The command seq
• The while loop
• Loop until
• Controlling the loop (break, continue)

Text Processing

• Command head, tail
• Sort, Uniq, Expand, Unexpand
• Cut, Paste, Join, Wc,Tr

Text search (grep)

Stream Editor (sed)

Interactive programs

• Read command
• User select

Features

Sleep command

If the script does not work? (debugging)