Read an environment variable in Kotlin

This post will discuss how to read the value of an environment variable in Kotlin.

1. Using `System.getenv()` function

The standard solution is to use the System.getenv(), which returns an unmodifiable map of the current system environment variables.

fun main() {

val env: MutableMap<String, String> = System.getenv()

println("Path: ${env["OS"]}") // Path: Windows_NT

}

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2. Using `System.getenv(String)` function

To get a specific environment variable, you can directly call the overloaded version of the getenv() function, which accepts the environment variable’s name and returns the value of that variable from the system environment.

fun main() {

val path = System.getenv("OS")

println(path) // Windows_NT

}

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This returns null if the specified variable is not defined in the system environment. To return a default value instead of the null value, you can use the Elvis operator.

fun main() {

val path = System.getenv("OS") ?: "Not Found"

println(path) // Windows_NT

}

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That’s all about reading an environment variable in Kotlin.

Read an environment variable in Kotlin

1. Using System.getenv() function

2. Using System.getenv(String) function

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1. Using `System.getenv()` function

2. Using `System.getenv(String)` function