Introduction
This challenge will cover the basics of environment variables in Unix programs. Environment variables are used to convey configuration information to programs.
This challenge will cover the basics of environment variables in Unix programs. Environment variables are used to convey configuration information to programs.
In this challenge, you will need to set, get, and list environment variables.
os.Setenv
to set a key/value pair.os.Getenv
to get a value for a key.os.Environ
to list all key/value pairs in the environment.strings.SplitN
to split the key and value.## Running the program shows that we pick up the value
## for `FOO` that we set in the program, but that
## `BAR` is empty.
$ go run environment-variables.go
FOO: 1
BAR:
## The list of keys in the environment will depend on your
## particular machine.
TERM_PROGRAM
PATH
SHELL
...
FOO
## If we set `BAR` in the environment first, the running
## program picks that value up.
$ BAR=2 go run environment-variables.go
FOO: 1
BAR: 2
...
In this challenge, you learned how to set, get, and list environment variables in Unix programs. This is a fundamental concept that is used in many programs to convey configuration information.