Integer variables in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an integer variable in bash scripting?

An integer variable in bash is a variable that stores whole numbers without decimals. It is used to perform arithmetic operations easily.

beginner

How do you declare an integer variable in bash?

You declare an integer variable by using the keyword declare -i followed by the variable name. For example: declare -i count=5.

intermediate

What happens if you assign a non-integer value to an integer variable in bash?

Bash will try to convert the value to an integer. If it cannot, the variable will be set to 0.

beginner

How can you perform arithmetic operations with integer variables in bash?

You can use arithmetic expansion like $(( expression )). For example: sum=$((a + b)) adds two integer variables.

beginner

Why use integer variables instead of regular variables for numbers in bash?

Integer variables ensure that arithmetic operations work correctly and prevent errors from treating numbers as strings.

How do you declare an integer variable named 'num' with value 10 in bash?

A int num=10

B declare -i num=10

C num=10

D var num=10

In bash, declare -i is used to declare integer variables.

What will be the value of an integer variable if you assign 'abc' to it?

A 0

B abc

C null

D error

Bash converts non-integer assignments to 0 for integer variables.

Which syntax correctly adds two integer variables 'a' and 'b' in bash?

A sum=$((a + b))

B sum = $(a + b)

C sum = $a + $b

D sum = a + b

Arithmetic expansion $(( )) is used for calculations in bash.

What keyword is used to declare an integer variable in bash?

A int

B integer

C declare -i

D var

declare -i is the bash keyword for integer variables.

Why is it better to use integer variables for numbers in bash scripts?

A To make scripts run faster

B To store text values

C To save memory

D To perform arithmetic correctly

Integer variables ensure arithmetic operations work properly.

Explain how to declare and use integer variables in bash scripting.

Think about how bash treats numbers and how to do math with variables.

Describe why integer variables are important in bash scripts and how they differ from regular variables.

Consider what happens when you do math with strings vs integers.