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Golang program to unset the value of environment variable

Here, we are going to learn how to unset the value of environment variable in Golang (Go Language)?
Submitted by Nidhi, on April 20, 2021 [Last updated : March 05, 2023]

Unset the value of environment variable in Golang

Problem Solution:

In this program, we will set and unset the value of the specified environment variable using os.Setenv() and os.Unsetenv() functions. Both functions return an error if we pass the wrong parameters.

Program/Source Code:

The source code to unset the value of the environment variable is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

Golang code to unset the value of environment variable

// Golang program to unset the value of
// environment variable

package main

import "fmt"
import "os"

func main() {
	err := os.Setenv("City", "New Delhi")

	if err != nil {
		panic(err)
	}
	fmt.Println("City: ", os.Getenv("City"))

	err = os.Unsetenv("City")
	if err != nil {
		panic(err)
	}
	fmt.Println("City: ", os.Getenv("City"))
}

Output:

City:  New Delhi
City:  

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the "fmt" package to use the Printf() function and we also imported the "os" package to use the Setenv() function.

In the main() function, we set and unset the value of the City environment variable using Setenv() and Unsetenv() functions and print the result on the console screen.

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