Bash Advanced Scripting and File I/O

Overview/Description
Target Audience
Prerequisites
Expected Duration
Lesson Objectives
Course Number
Expertise Level

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Overview/Description
Explore Bash advanced scripting, such as how to parse output from external commands and handle file I/O. See how to catch and trap interrupts and signals. Employ brace expansion with data ranges. Generate and execute strings as commands with eval. Apply default values for input to handle undefined variables. Create a recursive function and script. Display textual progress indicators. Make a dynamic script inside a script. Read data from a text file into an array, with map file. Edit File Contents with the sed command, and select data from files with the awk command.

Target Audience
System administrators, DevOPS, software developers, and users who may need to create scripts to automate processes in a Linux or Linux-like environment

Prerequisites
None

Expected Duration (hours)
1.2

Lesson Objectives

Bash Advanced Scripting and File I/O

start the course

catch signals or interrupts using traps in a Bash script to allow the script to exit gracefully or handle the interruption

create generated strings using brace expansion and use eval to execute strings as commands

use default values for input and work with undefined variables

create recursive functions and scripts to solve repetitive problems

use brace expansion to create, combine, and nest ranges, and create padded numeric values using zero padding

execute commands for other scripts and then use the output

create and implement progress indicators in a Bash script to show an activity or an estimate of when an activity should end

create a dynamic script inside a script and then execute that script

send a dynamically generated e-mail from a Bash script using built-in mail tools and commands

use mapfile to read data from a file into an array for further processing

edit file contents from within a Bash script by using the stream editor (sed)

use simple awk statements to extract data from a file or from the output of another command or script

create scripts that can trap signals and exit gracefully, display progress bar indicators, and read and modify data from a configuration file

Course Number:
os_doss_a03_it_enus

Expertise Level
Intermediate