CompTIA PenTest+ Practice Test

What is the correct syntax for an if statement in Bash?

1. if ($my_var == 1) { echo "Correct." }

2. if [ $my_var == 1 ]; then echo "Correct."; else echo "Incorrect."; fi

3. if [$my_var = 1]; { echo "Correct."; }

4. if ($my_var eq 1) { "Correct."; } else { "Incorrect."; }

The correct answer is: if [ $my_var == 1 ]; then echo "Correct."; else echo "Incorrect."; fi

The correct syntax for an if statement in Bash is represented by the choice that uses square brackets and includes the "then" command. In Bash scripting, conditions are typically enclosed within square brackets, and a command must follow the condition after the "then" keyword to execute if the condition evaluates to true. The structure of the correct syntax encompasses: - Opening the condition with `if` followed by the condition between square brackets, with spaces separating the brackets and the variable. - Utilizing `==` or `=` to compare the variable to a value (though in Bash, `=` is more commonly used for string comparisons). - Including the `then` keyword to indicate that the following command should run if the condition is true. - Optionally providing an `else` statement to handle the scenario where the condition is false, along with the `fi` keyword to end the if statement structure. This flexibility makes the correct answer comprehensive, allowing for an action to be taken depending on whether the condition evaluates to true or false. Aspects of the other options demonstrate incorrect syntax or use of brackets that don't conform to Bash's requirements for conditional statements.