Bash Scripting 3

 Variables in Bash

Variable :

• Variable is a container used to store data.
• Variable declaration in bash is similar to other programming language.
• Here the data type need not to be declared as in python.
• Three ways of declaring variable in Bash:
• Declaring variable inside the Bash script
• Getting input from the user.
• Getting input through parameter.

• Declaring Variable inside the bash script:
• variable_name="variable"
• Note : Don't leave space.
  

  

  
  
• Getting input from the user:
• The "read" command is used to get input in bash script.
• read followed by the variable_name.
• read <variable_name>
  

  

  
  
  

  
  
  
  
• Getting input through parameter:
• It is possible by decalring the variable_name to $1. Here the $1 indicate the first parameter.
• It can be made for any number.
• While running,After "bash <file_name> is consider as parameter 1"
• Example : bash <file_name> 1 2 3 ....