Bash Scripting 1

 Bash Scripting

What is Bash?

• BASH - Bourne Again Shell.
• Bash is the most widely used shell in linux system.
• It is used as a default login shell in linux system and macOS.
• It can be also be installed in windows system.
• It is similar to programming languages like python,c,c++,java,etc..
• It has some syntax to follow ,to execute commads.

Advantages of Bash scripting:

• The syntax and commands of bash are similar to the individual command in terminal.
• The syntax are similar to other programming language,which make programmer not to shift completely to other language.
• Quick start.
• Interactive debugging 

Disadvantages of Bash scripting:

• Single change in command might make the code harmful.
• Slow execution.
• Not much suitable for large and complex code.

A Simple bash script to print "Hello".

• Create a file with extension ".sh"
• Always first line is "#!bin/bash/"
• Write the code .
• Save by Ctrl+O --> <Enter> --> Ctrl+X (if using nano editor).
• Change the permission by "chmod +x <file_name>"
• Run the script by "./<file_name>"
  
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• The chmod command is used to give permission to file. The +x gives all permission to the file like READ,WRITE,EXECUTE.