BASH SCRIPT

This is my new repository containing the stuff that I did when I started learning Bash Scripting.

Introduction

Intro.sh

This is the first file which contains details about the following topics:

• Bash Comments
  • Single Line
  • Multiline
• Bash Quotes
• Bash Variables
  • System Variables
  • User Defined Variables

Input.sh

This is the file which shows the ways in which we can accept user input using BASH Script. This file contains:

• Reading Single input
• Reading multiple inputs
• Use of -p flag (for accepting input in same line)
• Use of -sp flag (for accepting silent input)
• Use of -a flag (for accepting an array of values)

DateFormat.sh

This is the file that contains the various format options available for date Command. A glimpse of it is given below:

• Extracting month
• Extracting year
• Extracting weekday
• Extracting time related stuff
• Extracting timezone

PassingArguments.sh

This file contains details about passing arguments in the script. It shows the use of:

• Use of $1 $2 $3 .... to access the passed arguments
• Use of $@
• Use of $#

Sleep.sh

This file shows the use of sleep command to pause the execution of script for a specified duration.

Operators

ArithmeticOperators.sh

This file contains the basic arithmetic operators used in Bash Scripting. The following things are covered:

• Double Parenthesis Method
• Using let command

ArithmeticOperatorsOnFloatingValues.sh

This file contains the usage of arithmatic operators on floating point numbers. The three ways in which this can be done are discussed:

• Using bc command
• Using awk command
• Using Perl
• Using Python

RelationalOperators.sh

This file contains the basic realtional operators used in Bash Scripting.

• == and !=
• < and <=
• > and >=

LogicalOperators.sh

This file contains the basic logical operators used in Bash Scripting.

• &&
• ||
• !

BitwiseOperators.sh

This file contains the basic bitwise operators used in Bash Scripting.

• &
• |
• !
• ^
• >>
• <<

FileTestOperators.sh

This file contains details about operators used to check particular properties of files:

• Exists
• Read/Write/Execute permissions
• Character file/ Block file
• Null file

Conditional Statements

IfCondition.sh

This file contains details about using conditional statements in Bash with various types of if statements:

• if then
• if else
• if elif else
• nested if

BashCase.sh

This file conatains the use of case statements (switch case in other languages) in Bash for applying the conditions.

Loops

ForLoop.sh

This file contains the use of for loop in its various syntax.

• Simple for loop
• C-style for loop
• break and continue with for loop
• infinite for loop
• executing commands with for loop

WhileLoop.sh

This file contains the use of while loop in its various syntax.

• Simple while loop
• C-style while loop
• break and continue with while loop
• infinite while loop
• reading a file with while loop

UntilLoop.sh

This file contains the use of until loop and its difference with the while loop

• Simple until loop
• Until loop with multiple conditions

SelectLoop.sh

This file contains the use of select loop and its applications.

• Simple select loop
• Use of select loop with Bash Case

Strings

Basic.sh

This file contains basic operations performed on strings like:

• Comparing two strings
• Finding length of string
• Checking for null string

Split.sh

This file contains the methods by which we can split a string. Splitting can be done based on a blank space or a symbol.

Concatenate.sh

This file contains the methods used to concatenate or join two strings.

Substring.sh

This file contains various ways of partitioning a string based upon the starting index and the length of resulting string.

Practice Scripts

AppendText.sh

This file contains the Bash script to append a piece of text at the end of a file.

CheckCharacter.sh

This file uses Bash Case to check if a character entered by a user is uppercase, lowercase, a number or a symbol.