Bash scripting 5

Basic Arithmetic Operations 

Arithmetic Operations:

• Arithmetic operations are some of the basic mathematical operations like addition,subraction,...
• These small steps can be developed into a big code with massive logic.
• Basic mathematics knowlegde is enough to play with it.
• There are several steps to perform mathematical operations in bash:
• The expression should begin with "$"
• After "$" , two open and close paranthesis ,$((  ))
• It should have one space after opening paranthesis and one space before paranthesis.
• The expression value can be stored in a variable and also it can be directly printed as the output.
• Example : $(( val_1 + val_2 ))    It can be any valid operator.
• Lets run a operation directly in terminal.
  
  
  
  
  
  
  
• The between the values and operator is optional.
• Lets create a bash program ,That get two values and perform certain operations

  
  

  

  
  

  

  
  
• We can use build-in variables to perform mathematical operations.
• For Example,
• We can use $RANDOM and generate a random single digit number