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Bash Cookbook

Bash Cookbook

By : Brash, Ganesh Sanjiv Naik
1 (1)
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Bash Cookbook

Bash Cookbook

1 (1)
By: Brash, Ganesh Sanjiv Naik

Overview of this book

In Linux, one of the most commonly used and most powerful tools is the Bash shell. With its collection of engaging recipes, Bash Cookbook takes you through a series of exercises designed to teach you how to effectively use the Bash shell in order to create and execute your own scripts. The book starts by introducing you to the basics of using the Bash shell, also teaching you the fundamentals of generating any input from a command. With the help of a number of exercises, you will get to grips with the automation of daily tasks for sysadmins and power users. Once you have a hands-on understanding of the subject, you will move on to exploring more advanced projects that can solve real-world problems comprehensively on a Linux system. In addition to this, you will discover projects such as creating an application with a menu, beginning scripts on startup, parsing and displaying human-readable information, and executing remote commands with authentication using self-generated Secure Shell (SSH) keys. By the end of this book, you will have gained significant experience of solving real-world problems, from automating routine tasks to managing your systems and creating your own scripts.
Table of Contents (10 chapters)
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Creating Syslog entries and generating an alarm  


In this section, we are going to discuss the syslog protocol. We'll also learn about the logger command, which is a shell command and acts as an interface for the syslog module. The logger command makes entries in the system log. In this section, we are also going to create an alarm using a script.

Getting ready

Besides having a terminal open, we need to make sure you have a file to make an entry.

How to do it...

  1. We are going to use the logger command to enter file_name into the syslog file. Run the following command:
$ logger -f file_name
  1. Now we are going to write a script to create an alarm. Create a create_alarm.sh script and write the following code in it:
#!/bin/bash
declare -i H
declare -i M
declare -i cur_H
declare -i cur_M
declare -i min_left
declare -i hour_left
echo -e "What time do you Wake Up?"
read H
echo -e "and Minutes?"
read  M
cur_H=`date +%H`
cur_M=`date +%M`
echo "You Selected "
echo "$H:$M"
echo -e "\nIt is Currently $cur_H:...

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