2 June 2025 Report - Day 8 - Basics of bash scripting

Content

I briefed with chapter 2 and 3 previous sections and then continued with the chapter 3 today. The topics I learnt are:

1. Shell Variables
   Shell variables have a value associated with it. Undefined variable value is blank.

2. Variables and Quoting
   Variables require double quotes to preserve and ensure the correct evaluation of the variable value.

3. Editing mode variables and some time stamp formats

4. Mail Variables

Some commands that I learned are:

1. Syntax for defining variables

varname=value

1. Use the dollar sign ($) before the variable name

echo "$varname"

1. Use the unset command to remove the variable

unset varname

1. echo command: Use to see value of variable

echo $varname

1. Use time stamp format

HISTTIMEFORMAT="%y/%m/%d %T "

1. MAIL: Add filename to check the mail in it

MAIL=filename