Get environment variables.

GetOrDefaultBool returns the given environment variable value as a boolean.

GetOrDefaultInt returns the given environment variable value as an integer.

GetOrDefaultSecond returns the given environment variable value as an time.Duration (second).

GetOrDefaultString returns the given environment variable value as a string.

GetOrFile Attempts to resolve 'key' as an environment variable.

GetWithFallback Get environment variable values The first name in each group is use as key in the result map // LEGO_ONE="ONE" // LEGO_TWO="TWO" env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"}) // => "LEGO_ONE" = "ONE" ---- // LEGO_ONE="" // LEGO_TWO="TWO" env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"}) // => "LEGO_ONE" = "TWO" ---- // LEGO_ONE="" // LEGO_TWO="" env.GetWithFallback([]string{"LEGO_ONE", "LEGO_TWO"}) // => error .