Which is the correct notation for arithmetic in bash?

Eugene Braun asked a question: Which is the correct notation for arithmetic in bash?
Asked By: Eugene Braun
Date created: Fri, Jun 25, 2021 7:34 AM

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Top best answers to the question «Which is the correct notation for arithmetic in bash»

  • The $ ((...)) notation is what is called the Arithmetic Expansion while the ((...)) notation is called a compound command used to evaluate an arithmetic expression in Bash. The Arithmetic Expansion notation should be the preferred way unless doing an arithmetic evaluation in a Bash if statement, in a Bash for loop, or similar statements.

FAQ

Those who are looking for an answer to the question «Which is the correct notation for arithmetic in bash?» often ask the following questions:

💻 How do you do arithmetic in bash?

The recommended way to evaluate arithmetic expressions with integers in Bash is to use the Arithmetic Expansion capability of the shell. The builtin shell expansion allows you to use the parentheses ((...)) to do math calculations. The format for the Bash arithmetic expansion is $(( arithmetic expression )) .

💻 How to do arithmetic expansion in bash shell?

  • Arithmetic Expansion in Bash Shell. Arithmetic expansion and evaluation is done by placing an integer expression using the following format: $((expression)) $(( n1+n2 )) $(( n1/n2 )) $(( n1-n2 )) Add two numbers on fly using the echo command: echo $(( 10 + 5 )) Add two numbers using x and y variable.

💻 How to test if statement arithmetic in bash?

  • The ( ( )) operator evaluates expressions as C arithmetic, and has a boolean return. Hence, ( ( 0 )) is false, and ( ( 1 )) is true. [1] The $ ( ( )) operator also expands C arithmetic expressions, but instead of returning true/false, it returns the value instead. Because of this you can test the output if $ ( ( )) in this fashion: [2]

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