checking in before refactoring interpolation

envs/utils_nonwindows.go

@@ -0,0 +1,18 @@
+//go:build !windows
+
+package envs
+
+import (
+	`os`
+)
+
+/*
+	interpolateString takes string s and performs environment variable interpolation/substitution on it.
+	err will always be nil; it's here for compat with the Windows equivalent.
+*/
+func interpolateString(s string) (subbed string, err error) {
+
+	subbed = os.ExpandEnv(s)
+
+	return
+}