How to declare boolean variable in shell script

The shell (bash) script doesn’t offer any data type with the variables. So we can’t specifically declare a variable of type boolean in shell scripts.

But, you can still use the variable like a boolean in shell scripts. Store a sample string 「true」 to a variable and match it with the if condition. This works similarly to boolean.

#!/usr/bin/env bash # Assign a string to a variable var=true # Test the variable value if [ "$var" = 'true' ]; then echo "It's true" else echo "It's false" fi1234567891011#!/usr/bin/env bash # Assign a string to a variablevar=true # Test the variable valueif [ "$var" = 'true' ]; then   echo "It's true"else   echo "It's false"fi

So, even if the shell script doesn’t offer the data types, but we can still use the normal variable with similar working.